come along vs come on

come along and come on both are verbs.

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

As verbs, come along and come on are synonyms defined as:

Other synonyms of come along include advance, get along, get on, progress, shape up.

come along (verb)	come on (verb)
come into being or existence, or appear on the scene	occur or become available
develop in a positive way	appear or become visible; make a showing
	develop in a positive way
	start running, functioning, or operating
	move towards