crowd together vs crowd

crowd together is not a noun while crowd is a noun.

Word	Noun	Adjective	Verb	Adverb
crowd together	No	No	Yes	No
crowd	Yes	No	Yes	No

As verbs, crowd together and crowd are synonyms defined as:

crowd together (noun)	crowd (noun)
	a large number of things or people considered together
	an informal body of friends

crowd together (verb)	crowd (verb)
to gather together in large numbers	to gather together in large numbers
	cause to herd, drive, or crowd together
	approach a certain age or speed
	fill or occupy to the point of overflowing