Omniscient, Omnipotent, Omnipresent.
Maybe Omnivorous, though the jury is still out on that one.
slow
words like obey, own, owl, and octopus
Nouns are not describing words, adjectives are the words that describe noun; people is a noun. Some adjectives starting with O that describe people are:objectiveobliviousobsessedobtuseobviousoldopenopportunisticoriginalorneryostentatiousowlishSome nouns for people that start with O are:oboistoceanographerofficerOlympianopera singeropportunistophthalmologistorganistornithologistorthopedistoutsideroyster farmer
Ornery, obsessed, odious, old, and oppressive are a few.
It depends on the meaning you're using for the word "caring." Two words that fit are: Objecting (caring; having an opinion) Overseeing (caring; tending to)
Outstanding!
Obscene would describe someone's character. It begins with the letter o.
slow
off on of ooh
a
iklpokl-o;p
ophidian
words like obey, own, owl, and octopus
Overflowing, ominous, erupting.
uhmm? orange?
One word, Obnoxious
outstanding