come on vs appear

come on and appear both are verbs.

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

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

come on (verb)	appear (verb)
occur or become available	come into sight or view
appear or become visible; make a showing	be issued or published
develop in a positive way	come into being or existence, or appear on the scene
start running, functioning, or operating	appear as a character on stage or appear in a play, etc.
move towards	give a certain impression of being something or having a certain aspect
	(of a proposition) seem to be true, probable, or apparent
	present oneself formally, as before a (judicial) authority