people vs multitude

people and multitude both are nouns.

Word	Noun	Adjective	Verb	Adverb
people	Yes	No	Yes	No
multitude	Yes	No	No	No

As nouns, people and multitude are synonyms defined as:

Other synonyms of people include hoi polloi, mass, masses, the great unwashed.

people (noun)	multitude (noun)
(plural) any group of human beings (men or women or children) collectively	a large gathering of people
the body of citizens of a state or country	the common people generally
members of a family line	a large indefinite quantity
the common people generally

people (verb)	multitude (verb)
fill with people
furnish with people