Ulango	English
oaso	oasis
obei	obey
objekto	object
objektiva	objective
obli	multiply
oblika	oblique
observi	observe
disobservi	violate
obstaklo	obstacle
obstetrika	obstetrical
obstina	obstinate
obtusa	obtuse
obvia	obvious
obuso	cannonball
oceno	ocean
ofendi	offend
ofendo	offence
oferi	offer
ofico	office
oficoro	officer
ofica	official
oficeyo	office
ofte	often
ogro	ogre
ohmo	ohm
ok	eight
oktavo	octave
oktobro	October
okulo	eye
okulisto	oculist
okulta	occult
okupi	occupy
okazi	occur, happen
ol	than
oleo	oil
oligarkio	oligarchy
Olimpiko	Olympic
olivo	olive
ombro	shade
omeleto	omelet
omeno	omen
ondo	wave
oni	somebody
ornitologio	ornithology
onklo	uncle, aunt
onklulo	uncle
onklino	aunt
onso	ounce
opaka	opaque
opalo	opal
opero	opera
opereyo	opera house
operati	operate
opio	opium
opinio	opinion
oportuna	opportune
optika	optical
optimismo	optimism
optimo	optimum
opto	option
opta	optional
oraklo	oracle
oranguto	orangutan
oranjo	orange
orato	oration
oratoro	orator
orbito	orbit
ordoni	order (v.)
ordo	order (n.)
ordinala	ordinal
ordinara	ordinary
orelo	ear
orfo	orphan
orfeyo	orphanage
organo	organ
organizi	organize
organizo	organization
orgio	orgy
origino	origin
orkestro	orchestra
orkido	orchid
orni	to ornament
orta	right
ortodoksa	orthodox
ortografio	orthography
ortografo	orthograph
oscili	oscillate
osto	bone
ovo	egg
ovala	oval
owko	oak
Oksfordo	Oxford
oksido	oxide
oksidizi	oxidize
oksigeno	oxygen
ostro	oyster
ozono	ozone