multitude vs laity

multitude and laity both are nouns.

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

As nouns, laity is a hyponym of multitude; that is, laity is a word with a more specific, narrower meaning than multitude:

multitude: the common people generally
laity: in Christianity, members of a religious community that do not have the priestly responsibilities of ordained clergy

Other hyponyms of multitude include temporalty, audience, followers, following.

multitude (noun)	laity (noun)
a large gathering of people	in Christianity, members of a religious community that do not have the priestly responsibilities of ordained clergy
the common people generally
a large indefinite quantity