oficiar - to officiate
ofrendar - to offer (religioso)
ofuscar - to dazzle (brillo/sol), to blind (celos)
ojear - to look at
olfatear - to smell, to sniff
omitir - to omit, to overlook
ondear - to wave, to waver
ondular - to wave
opacar - to make opaque
operar - to operate