words with "opa" in them, sorted by length (`awk '/opa/{ print length, $0 }' /usr/share/dict/words | sort -n -s | cut -d" " -f2-`)

gistfile1.txt

copa
dopa
opah
opal
chopa
copal
Mopan
nopal
oopak
popal
scopa
stopa
topaz
Atropa
Bacopa
copalm
copart
Europa
isopag
mopane
opaled
opaque
teopan
topass
topazy
tropal
atropal
copable
copaene
copaiba
Copaiva
copaiye
coparty
dopatta
jeopard
leopard
Litiopa
Nopalea
nopalry
opacate
opacify
opacite
opacity
opacous
opaline
opalish
opalize
opaloid
popadam
propago
propale
propane
ropable
scopate
tokopat
toparch
tropary
tropate
allopath
Chrysopa
copaibic
copaivic
copalche
copalite
coparent
copastor
copatain
copatron
jaspopal
jeopardy
leoparde
megalopa
myopathy
neopagan
opalesce
opalinid
opaquely
opopanax
otopathy
propanol
Proparia
rhopalic
Scolopax
scoparin
semiopal
syncopal
topalgia
toparchy
Topatopa
topazine
topazite
tragopan
tropaion
troparia
unopaque
Xylocopa
zoopathy
acropathy
aeropathy
allopathy
allopatry
anatropal
apocopate
Areopagus
autopathy
cacopathy
chloropal
chrysopal
Cleopatra
copacetic
Copaifera
coparceny
copartner
copatriot
corcopali
enjeopard
Episcopal
episcopal
erotopath
exopathic
gallopade
hemopathy
homeopath
homopathy
hydropath
hylopathy
Hypoparia
idiopathy
jeoparder
Kopagmiut
lalopathy
menopause
monopathy
Monotropa
myopathia
myopathic
neuropath
opacifier
opalesque
opalinine
orthopath
osteopath
otopathic
paulopast
Pelopaeus
pericopal
propagand
propagate
propanone
propapist
propargyl
proparian
pygopagus
rhopalism
rhopalium
Rhopalura
scoparius
stenopaic
subopaque
syncopate
taropatch
theopathy
toparchia
topazfels
troparion
adenopathy
albopannin
allopathic
allopatric
altropathy
anemopathy
angiopathy
antitropal
aortopathy
Aplopappus
apocopated
apotropaic
Areopagist
Areopagite
atropamine
autopathic
camelopard
coparallel
coparcener
copartaker
copartnery
copatentee
cyanopathy
dermopathy
desmopathy
endopathic
enjeopardy
episcopacy
episcopate
erotopathy
Europasian
hemitropal
homeopathy
homoeopath
homotropal
horoscopal
hydropathy
idiopathic
isopachous
jeopardize
jeopardous
kiloparsec
lecotropal
leopardess
leopardine
leopardite
mastopathy
mazopathia
mazopathic
menopausal
menopausic
metropathy
monopathic
myelopathy
myoparesis
naturopath
necropathy
neopallial
neopallium
neuropathy
nonopacity
oariopathy
opalescent
opaqueness
orthopathy
osteopathy
periscopal
peritropal
philopagan
philopater
phonopathy
photopathy
Plasmopara
propadiene
propagable
propaganda
propagator
propagulum
propalinal
propayment
protopapas
protopathy
psychopath
radiopaque
semiopaque
somnopathy
syncopated
syncopator
theopathic
thermopair
thymopathy
topazolite
tropaeolin
Tropaeolum
tropopause
xiphopagic
xiphopagus
allopathist
amphitropal
anisotropal
apocopation
apotropaion
apotropaism
Areopagitic
arthropathy
atropaceous
azoparaffin
cardiopathy
colonopathy
copalcocote
coparcenary
copastorate
copatroness
cosmopathic
craniopagus
craniopathy
cyanopathic
dermopathic
developable
dipropargyl
dopamelanin
dopaoxidase
Echinopanax
enteropathy
Eopaleozoic
episcopable
Episcopally
episcopally
erotopathic
gastropathy
glossopathy
Gymnopaedes
gymnopaedic
gynecopathy
hepatopathy
heteropathy
hieropathic
homeopathic
homoeopathy
hydropathic
hylopathism
hylopathist
isoparaffin
leopardwood
lymphopathy
melanopathy
metropathia
metropathic
microscopal
monoparesis
myelopathic
nasopalatal
naturopathy
Nemopanthus
neopaganism
neopaganize
neoparaffin
nephropathy
neuropathic
oariopathic
octopartite
odontopathy
onychopathy
opacousness
opalescence
organopathy
orthopathic
orthotropal
osteopathic
oxycopaivic
photopathic
phrenopathy
propagandic
propagation
propagative
propagatory
propargylic
propatagial
propatagian
propatagium
prosopalgia
prosopalgic
protopappas
protoparent
protopathia
protopathic
psychopathy
pteropaedes
pteropaedic
ptilopaedes
ptilopaedic
Ptychoparia
ptychoparid
radiopacity
radiopalmar
repropagate
Rhopalocera
Scleropages
Scleroparei
scolopacine
semiopacity
semiopacous
splenopathy
syncopation
taboparesis
taboparetic
theopantism
toparchical
toxicopathy
trichopathy
trophopathy
unepiscopal
uropatagium
vasoparesis
wereleopard
xiphopagous
yajnopavita
zoopantheon
zooparasite
Acanthopanax
allopathetic
angioparesis
Areopagitica
arteriopathy
arthropathic
bronchopathy
Camelopardid
Camelopardus
cardiopathic
cephalopagus
cephalopathy
cerebropathy
chromoparous
copaliferous
copassionate
craniopathic
cryptopapist
cubitopalmar
cyclopropane
deuteropathy
ectoparasite
ectopatagium
electropathy
emmeniopathy
enantiopathy
endoparasite
entoparasite
Eopalaeozoic
episcopalian
episcopalism
episcopality
episcopature
erectopatent
ethmopalatal
galactopathy
gastropathic
gynecopathic
heteropathic
heterotropal
holoparasite
homeopathist
homoeopathic
hydropathist
hysteropathy
idiopathetic
idiopathical
jeopardously
labiopalatal
laryngopathy
mediopalatal
mediopassive
melanopathia
misopaterist
monepiscopal
monoparental
myopachynsis
myoparalysis
nasopalatine
naturopathic
Neopaleozoic
nephropathic
neuropathist
nonepiscopal
oecoparasite
omphalopagus
onychopathic
Opisthoparia
Ornithopappi
osteopaedion
osteopathist
philopatrian
phrenopathia
phrenopathic
propaedeutic
propagandism
propagandist
propagandize
propagatress
proparasceve
propatriotic
propatronage
protopattern
psychopathia
psychopathic
ptychopariid
rhopaloceral
scolopaceous
Scolopacidae
steatopathic
stomatopathy
Theopaschist
Theopaschite
theopathetic
thoracopagus
toxicopathic
tracheopathy
trichopathic
tritopatores
tropacocaine
unpropagated
unsyncopated
xenoparasite
zooparasitic
zoopathology
acroparalysis
acropathology
aeolopantalon
allopalladium
amygdalopathy
anthropopathy
antiepiscopal
arteriopalmus
caesaropapacy
caesaropapism
campulitropal
campylotropal
chiropatagium
chorepiscopal
chromatopathy
copartnership
cycloparaffin
cytopathology
dermatopathia
dermatopathic
deuteropathic
ectoparasitic
electropathic
enantiopathia
enantiopathic
endoparasitic
enteroparesis
entoparasitic
esophagopathy
ethmopalatine
gastroparesis
hemopathology
holoparasitic
homoeopathist
hydropathical
Kathopanishad
labiopalatine
linguopalatal
maculopapular
mastoparietal
mediopalatine
methylpropane
microparasite
monepiscopacy
Monotropaceae
mythopastoral
myxopapilloma
naturopathist
neuropathical
neutropassive
nitroparaffin
opacification
opisthoparian
Parthenopaeus
pharyngopathy
phytoparasite
phytopathogen
pneumonopathy
propaedeutics
propagability
propagational
proparoxytone
propatriotism
pseudoparesis
psychopathist
radiatopatent
ramosopalmate
recurvopatent
rhopalocerous
semianatropal
silicopropane
spondylopathy
taboparalysis
teloteropathy
Theopaschitic
thorocopagous
tracheopathia
tropaeolaceae
undevelopable
unepiscopally
uteroparietal
aerohydropathy
allopathically
allopatrically
angioparalysis
angioparalytic
anteroparietal
anthropopathia
anthropopathic
archiepiscopal
autoparasitism
Camelopardalis
Camelopardidae
cheiropatagium
chloropalladic
chromatopathia
chromatopathic
coroparelcysis
coxarthropathy
cystoparalysis
cytopathologic
desmopathology
developability
Ectoparasitica
encephalopathy
endocrinopathy
Endoparasitica
fibropapilloma
frontoparietal
gastroparietal
glossopalatine
gutturopalatal
hippopathology
histopathology
homeopathician
homeopathicity
idiopathically
integropallial
iridoparalysis
jeopardousness
laemoparalysis
maxillopalatal
mesoparapteral
mesoparapteron
metroparalysis
microparasitic
micropathology
molybdoparesis
monotropaceous
musculopallial
myeloparalysis
neuroparalysis
neuroparalytic
neuropathology
nondevelopable
nonpropagation
oculopalpebral
oecoparasitism
ophthalmopathy
paleopathology
pancreatopathy
parthenoparous
peritoneopathy
phytopathology
plagiopatagium
plasmatoparous
polyneuropathy
propaedeutical
propagableness
propagandistic
proparoxytonic
prosopantritis
protopatrician
psychopannychy
pterygopalatal
semiopalescent
sensoparalysis
sphenopalatine
sphenoparietal
splanchnopathy
squamoparietal
teloteropathic
Theopaschitism
tropaeolaceous
ultraepiscopal
vomeropalatine
xenoparasitism
zoopathologist
acroparesthesia
anthropopathism
anthropopathite
archiepiscopacy
archiepiscopate
arthropathology
autopathography
branchiopallial
cardioparplasis
cerebroparietal
cytoparaplastin
dactylopatagium
embryopathology
encephalopathia
encephalopathic
endocrinopathic
enteroparalysis
Episcopalianism
Episcopalianize
faradopalpation
gastroparalysis
glossopalatinus
gutturopalatine
hematopathology
histopathologic
homeopathically
homoeopathician
homoeopathicity
Hydroparastatae
Integropalliata
integropalliate
labiopalatalize
lienopancreatic
ludicropathetic
lymphadenopathy
maxillopalatine
micropantograph
monoparesthesia
nephroparalysis
neurarthropathy
neuropathically
nonepiscopalian
onychopathology
opticopapillary
orbitopalpebral
orthopathically
osteopathically
palaeopathology
phytopathogenic
phytopathologic
pneumonoparesis
poliomyelopathy
posteroparietal
proctoparalysis
proparliamental
pseudepiscopacy
pseudoepiscopal
pseudoparalysis
pseudoparalytic
pseudoparasitic
pseudopatriotic
psychopanychite
pterygopalatine
rachioparalysis
retinopapilitis
salpingopalatal
seriopantomimic
splenoparectama
stethoparalysis
temporoparietal
Theopaschitally
thermopalpation
visceroparietal
zoopaleontology
zoopathological
allopathetically
archiepiscopally
auriculoparietal
chloropalladates
cytopathological
dermatopathology
desmopathologist
electropathology
gastropancreatic
histopathologist
homoeopathically
Integropallialia
laryngoparalysis
linguopapillitis
micropathologist
neuropathologist
neuropsychopathy
occipitoparietal
osteoarthropathy
parachromoparous
pediculoparietal
pharyngopalatine
phytopathologist
plicatopapillose
proparticipation
protopatriarchal
pseudopapaverine
pseudoparaplegia
pseudoparasitism
pseudoparenchyma
pseudoparenchyme
psychopannychian
psychopannychism
psychopannychist
psychopathologic
salpingopalatine
splenopancreatic
splenoparectasis
squamosoparietal
anatomopathologic
bacteriopathology
celioparacentesis
counterpropaganda
electrohomeopathy
hippopathological
histopathological
hydroparacoumaric
micropaleontology
micropathological
neuropathological
neuropsychopathic
nonpropagandistic
osteochondropathy
pharyngopalatinus
pharyngoparalysis
phytopaleontology
phytopathological
psychopathologist
sulphoparaldehyde
anthropopathically
Christianopaganism
cytopathologically
dermatopathophobia
gastropancreatitis
geoparallelotropic
hyperarchepiscopal
physiopathological
phytopaleontologic
propagandistically
psychopannychistic
psychopathological
teloteropathically
anatomicopathologic
anatomopathological
basicytoparaplastin
cephalothoracopagus
clinicopathological
counterpropagandize
encephalomyelopathy
ichthyopaleontology
phytopaleontologist
propanedicarboxylic
phytopaleontological
pseudoparenchymatous
tychoparthenogenesis
anatomicopathological
duodenopancreatectomy
pseudoparthenogenesis
thyroparathyroidectomy
thyroparathyroidectomize