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oak

oath

obedient 

obese

object

objection

objective

obituary

obligation

oblige

oblivion

obscure

observation

observe

obtain

obviously

occasion

occasionally

October

occupation

occupy

occur

ocean

o’clock

odds

of course

of

off

offense

offensive

office

official

offer

officer

officially

oil

oily

ointment

okay

old

old-fashioned 

older

Olympics

omelette

omission

omit

on

once

one

oneself

onion

online

only

onto 

open

opening

opera

operate

operation

operator

opinion

opponent

opposition

opportunity

oppose

opposite

opt

option

optional 

or

orange

orbit

orchestra

orchard

order

ordinary

organ

organic

organization

organize

orientation

original

origin

originally

orthodox

other

ounce

our

ours

ourselves

out

outcome

outdoor

outdoors 

outgoing

outfit

outer

outline

outlook

output

outrageous

outstanding

outside

outspoken 

outward

oven

over

overall

overcome

overdo

overdone 

overestimate

overflow

overload

overnight

overseas

overtake

overtime

overwhelm

overwork

owe

owing

own

owner

ownership

ox 

oxygen