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:
Some nouns for people that start with O are:
Chat with our AI personalities
Some things (nouns) that start with the letter I are:ibisiceicebergice creamicicleicingiconidideaidiomidiotignoranceillusionimaginationimpulseinchincisorindependenceingotinquiryinspirationinventioninvitationionireiridesenceirisiritationironivory
The adjective that starts with letter M that describes the Montagues is mean.
A dictionary would be a good place for you to research such a lengthy question/answer.
Some abstract nouns the begin with the letter O are:oblivionobservationoccasionoddityomenopennessopinionoptimismorganizationoriginalityovationoxymoron
a pencil or a piece of paper begins with p and they both are things.ploppigpancakepeoplepansypagephrasepeaspiespilepantherpurplepeepeacockspuppiespinkpencilpenpinpennypastypappypurpleplaypennypictuepizza