crowd vs come on

crowd is a noun but come on is not a noun.

Word	Noun	Adjective	Verb	Adverb
crowd	Yes	No	Yes	No
come on	No	No	Yes	No

As verbs, come on is a hypernym of crowd; that is, come on is a word with a broader meaning than crowd:

Other hypernyms of crowd include approach, come near, draw close, draw near, go up, near.

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

crowd (verb)	come on (verb)
to gather together in large numbers	occur or become available
cause to herd, drive, or crowd together	appear or become visible; make a showing
approach a certain age or speed	develop in a positive way
fill or occupy to the point of overflowing	start running, functioning, or operating
	move towards