Merriam-Webster's Collegiate Dictionary:
over-the-counter
over-the-hill
over-the-top
over-the-transom
overachieve
overachievement
overachiever
overact
overaction
overactive
overactivity
overage
overaged
overall
overalled
overarching
overarm
overawe
overbalance
overbear
overbearing
overbearingly
overbid
overbite
overblouse
overblown
overboard
overbook
overbought
overbreed
overbuild
overburden
overbuy
overcall
overcapacity
overcapitalization
overcapitalize
overcast
overcast stitch
overcasting
overcharge
overclass
overcloud
overcoat
overcome
overcomer
overcommit
overcommitment
overcompensate
overcompensation
overcompensatory
overcrowd
overcut
overdesign
overdetermined
overdevelop
overdevelopment
overdiagnosis
overdo
overdog
overdominance
overdominant
overdosage
overdose
overdraft
overdraw
overdrawn
overdress
overdrive
overdub
overdue
overeat
overeater
overexpose
overexposure
overextend
overextension
overfatigue
overfatigued
overfeed
overfill
overfish
overflight
overflow
overfly
overgarment
overglaze
overgraze
overgrow
overgrown
overgrowth
overhand
overhand knot
overhanded
overhang
overhaul
overhead
