multitude vs group

multitude and group both are nouns.

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

As nouns, group is a hypernym of multitude; that is, group is a word with a broader meaning than multitude:

Other hypernyms of multitude include grouping.

multitude (noun)	group (noun)
a large gathering of people	any number of entities (members) considered as a unit
the common people generally	a set that is closed, associative, has an identity element and every element has an inverse
a large indefinite quantity	(chemistry) two or more atoms bound together as a single unit and forming part of a molecule

multitude (verb)	group (verb)
	arrange into a group or groups
	form a group or group together