Wikipedia:Lists of common misspellings/O


 * (obscene)
 * (obscenity)
 * (obedience)
 * (obedient)
 * (observation)
 * (objective)
 * (oblige, oblique)
 * (obliged)
 * (observance)
 * (observer)
 * (obsolescence)
 * (obsolescence)
 * (obsolescence)
 * (obsolescence)
 * (obsession)
 * (obsessive)
 * (obstacle)
 * (obstacle)
 * (occasion)
 * (occasional)
 * (occasionally)
 * (occasionally)
 * (occasioned)
 * (occasions)
 * (occasion)
 * (occasional)
 * (occasionally)
 * (occasioned)
 * (occasions)
 * (occasionally)
 * (occasionally)
 * (occasional)
 * (occasion)
 * (occasional)
 * (occasionally)
 * (occasionally)
 * (occasioned)
 * (occasions)
 * (occur)
 * (occurrence)
 * (occurrences)
 * (occurred)
 * (occurrence)
 * (occurrences)
 * (occurring)
 * (occur)
 * (occurrence)
 * (occurrences)
 * (October)
 * (October)
 * (October)
 * (October)
 * (October)
 * (octagon)
 * (octagonal)
 * (octahedra)
 * (octahedral)
 * (octahedron)
 * (October)
 * (October)
 * (octastyle)
 * (October)
 * (October)
 * (October)
 * (country)
 * (countries)
 * (occupied)
 * (occupy)
 * (occur)
 * (occurrence)
 * (occurred)
 * (occurrence)
 * (occurring)
 * (occurs)
 * (oddities)
 * odour (variant of odor)
 * (odoriferous, even in UK)
 * (odorous, even in UK)
 * (of course)
 * (office)
 * (official)
 * (officer)
 * (often)
 * offence (variant of offense)
 * (offender)
 * offense (variant of offence)
 * (official)
 * (officially)
 * (officially)
 * (officially)
 * (offshoot)
 * (official)
 * (often)
 * (often)
 * (of the)
 * (going, ogling)
 * (Oklahoma)
 * (only)
 * omelet (variant of omelette)
 * omelette (variant of omelet)
 * (omission)
 * (omitted)
 * (omitting)
 * (omit)
 * (omission)
 * (omission)
 * (omit)
 * (omitted)
 * (omitting)
 * (omitted)
 * (omitting)
 * (omnivorous)
 * (omnivorously)
 * (more)
 * (note, not)
 * (on the)
 * (on top)
 * (only)
 * (operate)
 * (opened)
 * (opened)
 * (operator)
 * (operation)
 * (opportunity)
 * (opine)
 * (opinion)
 * (upon)
 * (opponent)
 * (opportunity)
 * (oppose)
 * (opposite)
 * (opposition)
 * (open)
 * (opened)
 * (opening)
 * (operate)
 * (operation)
 * (opportunity)
 * (opinion)
 * (opponent)
 * (opportunity)
 * (opportunities)
 * (opportunity)
 * (opposite)
 * (opportunity)
 * (opportunity)
 * (opportunity)
 * (oppress)
 * (oppression)
 * (oppressive)
 * (ophthalmic)
 * (ophthalmologist)
 * (ophthalmology)
 * (ophthalmologist)
 * (ophthalmology)
 * (ophthalmologist)
 * (ophthalmology)
 * (optimism)
 * (optimist)
 * (optimistic)
 * (orchestra)
 * (orchestral)
 * (ordered, orders)
 * (organisation)
 * (organise)
 * (organization)
 * (organize)
 * (organization)
 * (organic)
 * (organism)
 * organisation (variant of organization)
 * organise (variant of organize)
 * (origin, organ)
 * (original)
 * (originally)
 * (originate)
 * (organise)
 * (organization)
 * (organize)
 * orientate (British variant of orient [verb])
 * orientated (variant of oriented)
 * (orientation)
 * (original)
 * (originally)
 * (original)
 * (originate)
 * (original)
 * (originally)
 * (original)
 * (original)
 * (originate)
 * (original)
 * (original)
 * (orthogonal)
 * (orthogonally)
 * (orthogonal)
 * (orthogonally)
 * (OSs [plural])
 * (other)
 * (other)
 * (others)
 * (Ottoman)
 * (Ottoman empire etc but not the furniture)
 * (Ottawa)
 * (oeuvre)
 * (outside)
 * (outstanding)
 * (outside)
 * (outtake)
 * (outcast [verb])
 * (outlying)
 * (out loud)
 * (output [verb])
 * (outrageous)
 * (outer)
 * (outweighed)
 * (overran)
 * (overrated)
 * (overreach)
 * (override)
 * (overlaid)
 * (overrode)
 * (overshadowed)
 * (oversight)
 * (overrule)
 * (overrun)
 * (overwhelming)
 * (overture)
 * (work)
 * (would)
 * (oxen [plural], oxen's [possessive])
 * (ox's [possessive], oxen [plural])
 * (oxygen)
 * (oxymoron)
 * (oxygen)
 * (October)