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