O - Comparisons

Ovist vs. Ovum

Obstinacy vs. Stubbornness

Odema vs. Oedema

Orphanize vs. Orphan

Ocean vs. Asea

Ozonates vs. Ozonated

Observation vs. Spectation

Obstinateness vs. Obstinate

Ommission vs. Omission

Od vs. Synonym

Orchestra vs. Philharmonic

Outa vs. Outta

Oatmeal vs. Stirabout

Occasional vs. Seldom

Ouvre vs. Oeuvre

Occultness vs. Occult

Oftimes vs. Ofttimes

Oddball vs. Queer

Oule vs. Oute

Outpost vs. Post

Observer vs. Spectator

Overturn vs. Repeal

Overstrikes vs. Overstrides

Outerly vs. Utterly

Orbitosphenoid vs. Sphenoid

Omitted vs. Admitted

Offendor vs. Offender

Odeum vs. Odeon

Onery vs. Ornery

Opination vs. Opine

Outlaw vs. Rebel

Operant vs. Operator

Oxybenzene vs. Hydroxybenzene

Overwrite vs. Erase

Oleaginous vs. Unpretending

Operate vs. Function

Outskirts vs. Outpost

Odontology vs. Dentistry

Oule vs. Ule

Opportunities vs. Chances

Ogle vs. Oogle

Opponent vs. Opposition

Overlaid vs. Overlain

Ophiophobia vs. Ophiophobic

Obtrude vs. Obtruder

Orbed vs. Tired

Opries vs. Pries

Otter vs. Utter