(to return to Words Table of Contents, click here)
 
Words Beginning with "O"

 

Oaf

Oaken

Oar 

Oasis 

Oast 

Oatmeal

Obbligato 

Obcaecate 

Obcordate
Obduracy 

Obdurate 

Obeah 

Obedience
Obedient 

Obeisance
Obelia
Obelisk
Obelism
Obelus 

Oberek 

Oberon
Obertas 

Obese

Obesity

Obesogenic
Obey

Obfuscate
Obfuscation 

Obi
Obiter dictum
Obituary
Object
Objectify

Objection 

Objectionable 

Objective
Objurgate 

Oblast

Oblate

Oblateness 

Oblation
Obligation
Obligate 

Obligatory
Oblige 

Obliging 

Obligor 

Oblique
Obliquity 

Obliterate

Obliteration
Obliterative 

Oblivion

Oblivious

Obliviscence 

Oblong 

Obloquy

Obnoxious
Obnubilate 

Oboe

Obovate 

Obreption
Obreptitious
Obscura
Obscurantist
Obscure

Obsequy

Obsequious
Observe
Observer
Observation
Obsess 

Obsession
Obsessive

Obsidian 

Obsolesce

Obsolescence 

Obsolescent
Obstacle 

Obstetrician
Obstetrics 

Obstinacy 

Obstinate 

Obstipation 

Obstreperous

Obstruct
Obstruction
Obstructive
Obstruent
Obtain
Obtainable
Obtenebrate 

Obtrude 

Obtrusive 

Obtund

Obtundent 

Obturate
Obtuse
Obverse

Obviate

Obvious
Ocarina
Occasion
Occasional
Occident
Occidentalism 

Occipital 

Occitan 

Occlude
Occlusal 

Occlusion 

Occult

Occultation
Occupancy 

Occupant

Occupation
Occupy

Occurred
Occurrence 

Oceanic
Oceanography 

Oceanologist 

Oceanus
Ocellated 

Ocellus
Ocelot
Ochidore 

Ochlocracy 

Ochophobia 

Ochotonidae
Ochratoxin
Ochre 

Ochrea/Ocrea 

Ochreous 

Ochroma
Ocicat 

Ocimum
Ockhamist
Ocotillo 

Octaeteris 

Octagon
Octahedron 

Octane

Octanoic 

Octastichous
Octateuch
Octave
Octavo 

Octli 

Octopod 

Octopus

Octose
Octuple 

Ocular 

Ocypode 

Odalisque

Odd

Oddity

Oddment
Odds

Odds-on
Ode
Odeon 

Odeum

Odhani

Odious
Odium
Odobenidae 

Odograph 

Odontalgia
Odontoglossum 

Odontology

Odontoloxia 

Odylic
Odynophagia
Odysseus
Odyssey
Oedermerid 

Oedipal
Oedipus 

Oeillade

Oenochoe/Oinochoe
Oenology

Oenophile
Oenothera 

Oersted
Oeuvre

Offal
Off-again

Off-balance 

Offbeat 

Off-center
Offend
Offense
Offensive

Offensively 

Offer

Offering 

Offertory 

Offhand 

Official 

Officialdom
Officiate 

Officinal 

Officious

Off-kilter 

Off-limits 

Off-putting 

Offscouring
Offset 

Offspring
Off the cuff  

Oflag
Often 

Ogee
Ogle
Ogre
Oirat 

Oireachtas 

Ojibwe/Ojibwa  

Okapi
Okra 

Olallieberry
Older 

Old-fashioned 

Oleaceae 

Oleaginous

Oleander 

Oleandomycin 

Oleaster

Olecranon

Olefin 

Oleic 

Oleomargarine
Oleoresin 

Olfactory 

Olibanum
Olid

Olifant 

Oligocene

Oligoclase
Oligodendrocyte 

Oligodontia 

Olio 

Oliphant
Olivenite 

Olivine
Olmec 

Ololiuqui
Oloroso
Olympiad 

Olympian
Olympic 

Omadhaun
Omakase
Omani 

Omasum
Ombre 

Ombrogenous 

Ombrology
Ombrophilous 

Ombudsman
Omda 

Omega 

Omelet
Omen
Omental

Omentum
Omeprazole 

Omerta
Omiai 

Omicron 

Ominous
Omissibility  

Omission 

Omit
Ommastrephidae 

Ommateum  

Omnipotent
Omnipresence

Omnipresent
Omniscience 

Omniscient

Omnivore
Omnivorous
Omodynia
Omoplate 

Omphacite 

Omphalopsychite 

Omphalos 

Omphaloskepsis
On tap
On-again 

Onager

Onanism
Onchocerciasis 

Oncochaeta
Oncogene 

Oncology
Oncotic
Ondansetron
Ondful 

Oneida 

Oneiric

Oneiromancy

One-of-a-kind

One-off
Onerous 

Onetime
Oneupmanship
One-way
Ongoing 

Onium
Online
Onlooker
Onnagata 

Onolatry 

Onology
Onomamancy 

Onomasiology 

Onomastics 

Onomatology
Onomatope 

Onomatopoeia 

Onondaga
Onscreen
Onset

Onslaught 

Onstage 

Ontological

Ontology
Onus
Onychauxis 

Onychogryphosis 

Onychomadesis 

Onychorrhexis 

Onychoschizia 

Onyx

Oogenesis 

Oolitic 

Oology

Oolong
Oomycete
Oophorectomy
Ootheca 

Ooze

Opacity

Opah  

Opal 

Opalescent

Opaque

Open
Open-ended 

Open-minded
Opening

Openness

Openwork 

Opera 

Opera buffa
Operant
Operate
Operatic
Operation
Operational
Operations
Operator 

Operculum
Operetta 

Operose
Ophelia 

Ophicleide 

Ophichthidae
Ophidian 

Ophiology 

Ophiomorphous

Ophiophagous 

Ophir
Ophitic 

Ophiuroid
Ophryon 

Ophthalmia

Ophthalmology  

Opiate
Opificer 

Opine
Opinicus 

Opinion

Opinionated 

Opioid

Opiparous

Opiomania 
Opisthobranch 

Opisthosoma 

Opisthotonos
Opistognathidae 

Opitulate 

Opium 

Opluridae 

Opodeldoc
Opopanax
Opossum 

Opponent
Oppure
Opportune

Opportunist 

Opportunistic
Opportunity 

Opposable
Oppose
Opposition

Oppositional
Oppress

Oppression
Oppressive 

Oppressiveness 

Opprobrious 

Opprobrium
Oppugn 

Opry 

Opsimath

Opsonin 

Opt

Optative
Optic
Optical

Optician 

Optimal
Optimate  

Optime 

Optimize

Opulent
Opuntia 

Opus

Ora

Orache 

Oracle

Oracular

Oracy

Orality

Oranda 

Orange

Orangery 

Orangutan 

Orant 

Orarion
Orate 

Oration
Orator
Oratorio  

Oratory 

Orb
Orbit
Orbital
Orca 

Orcelite 

Orchardist 

Orchestra
Orchestral

Orchestrate
Orchestration

Orchid 

Orchidaceous
Orchiectomy

Orchil

Orchitis 
Orchomenus
Ordain
Ordeal 
Order

Ordered

Ordinal
Ordinance

Ordinary  

Ordinate 

Ordination 

Ordines 

Ordnance
Ordonnace
Ordovician 

Ordure
Oread
Orecchiette
Oreide
Oregano

Orestes 

Orff 

Organ

Organelle 

Organic
Organophosphate
Organum
Organza 

Orgeat
Orgiastic 

Orgone 

Orguinette
Orgulous
Orgy
Oribi
Oriel 

Orient
Orientalism 

Orientation
Orifice

Oriflamme

Origami 

Origin
Original
Originality
Origination
Oriole 

Orion

Orisha
Orismology
Orison 

Oriya 

Orkney
Orle
Ormazd 

Ormer 

Ormolu 

Ormosia 

Ormulum
Ornamentation
Ornate 

Ornery 

Ornithischian 

Ornithogalum 

Ornithology

Ornithomimidae 

Ornithorhynchidae 

Ornithoscopy
Ornithopod 

Orobanche 

Orogeny
Orographic 

Oroide 

Orology 

Oromandibular
Orontiaceous 

Orotund
Orphan

Orphanage 

Orpharion 

Orpheus

Orphism

Orphrey

Orpiment
Orpine 

Orrery 

Orris
Orthoclase
Orthocon

Orthodontist
Orthodonture
Orthodoxy 
Orthoepy 

Orthography
Orthopedics 

Orthopraxy 

Orthopyroxene 

Orthorexia
Orthorhombic
Orthotic
Orthotonos
Orthros 

Ortolan 

Orvieto
Orwellian 

Oryctology 

Orygine 

Oryx 

Oryza 

Oryzivorous
Osage
Osaka 

Oscan 

Oscillate 

Oscillator
Oscilloscope

Oscitancy 

Oscitant 

Osculate 

Osier

Osiris 

Osmanli
Osmanthus  

Osmium 

Osmoregulatory
Osmosis
Osmotic 
Osoberry
Osprey

Ossein
Osseous
Ossetian 

Ossianic 

Ossicle
Ossiculectomy
Ossifrage
Ossify 

Ossuary 

Ostariophysian 

Osteal
Osteichthyes
Osteitis
Ostensible
Ostensibly  

Ostensive 

Ostensorium
Ostentation 

Ostentatious

Osteoarthritis
Osteoarthropathy
Osteochondritis 

Osteoderm 

Osteomalacia 

Osteomyelitis 

Osteopath
Osteopenia 

Osteoporosis 

Osteospermum 

Osteotomy 

Ostiary
Ostinato
Ostiole 

Ostium 

Ostler
Ostpolitik
Ostraciidae
Ostracism 

Ostracize

Ostracon

Ostrich
Ostrogoth
Otacoustic 

Otaku
Otalgia 

Otariidae 

Otary
Other
Othering
Otherwise
Otherworldly
Otic 

Otiose
Otitis 

Otocyst 

Otolith 

Otologist 

Otorhinolaryngology 

Otosteon
Ottawa 

Ottoman
Ouabain 

Oubliette 

Ouguiya 

Ouija
Oupa 

Ouroboros 

Oushak 

Oust
Ouster

Outback
Outboard

Outbound 

Outbreak

Outburst 

Outcast
Outcropping
Outcry

Outdo 

Outermost
Outfight 

Outfit 

Outflow

Outfox
Outgoing
Outgrowth
Outhouse 

Outlandish

Outlast
Outlaw
Outlet

Outlier

Outline 

Outlive
Outlook 

Outmoded 

Outnumber
Outpace
Outperform 

Outpouring
Outrage
Outrage-fueled 

Outrageous

Outrance 

Outre

Outrecuidance 

Outremer
Outright
Outrun
Outside
Outsider 

Outsized
Outskirts
Outsmart
Outsource
Outstanding 

Outstrip
Outtake

Outthink

Outward  
Outweigh
Outwit
Ouzo 

Ovambo 

Ovarian
Ovary 

Ovate

Ovation
Overall

Overalls 

Overawe
Overbearing
Overburden 

Overcast 

Overcome
Overconfident
Overdo

Overdose
Overdue
Overelaborate

Overestimate
Overexert
Overextend 

Overfed

Overflow
Overflowing 

Overhang
Overhasty 

Overhaul 

Overindulge
Overjoyed
Overkill 

Overlook
Overlooking
Overlord 

Overmaster

Overpower 

Overprepare  

Overpriced
Overreach 

Override 

Oversee

Overseer 

Oversell 

Overset
Oversexed 

Oversight

Oversimplify
Oversized

Overspread

Overstress 

Overstrike 

Overt
Over-the-counter

Over-the-top
Overthrow

Overthwart 

Overturn

Overture
Overuse 

Overweening
Overweight

Overwhelm 

Overwrought
Overzealous 

Oviduct 

Oviparous
Ovoid 

Ovolo
Ovoviviparous 

Ovum

Owlet 

Owlish
Ownerless 

Ownership 

Ox
Oxidation 

Oxidative 

Oxide 

Oxidize
Oxonian
Oxter

Oxyanion 

Oxycodone  

Oxygen 

Oxygenation 

Oxygnathous 

Oxylophytic 

Oxymoron

Oxymuriatic 

Oxyntic
Oxytocin 

Oxytone
Oyesses
Oyez
Ozeki 

Ozone 

Ozymandias 

Next List 

Previous List