nouns
octopus
octogon
adjective
obtuse
obsurd
Obesity, occupation, omelet, opinion, orange, organ and overcoat are common nouns. They begin with the letter o.
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
objectionable
Examples of abstract nouns that begin with O are:obedienceoccurrenceoccupationoperationopinionorganizationoriginalityoncology
· olympic
outside
outstanding
overheadoutdooroverwhelming
obedient
· overwhelming
outstanding
ornate