come up vs go on

come up and go on both are verbs.

Word	Noun	Adjective	Verb	Adverb
come up	No	No	Yes	No
go on	No	No	Yes	No

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

Other hypernyms of come up include come about, fall out, hap, happen, occur, pass, pass off, take place.

As verbs, come up and go on are synonyms defined as:

Other synonyms of come up include come on.

come up (verb)	go on (verb)
result or issue	come to pass
start running, functioning, or operating	continue talking
gather or bring together	start running, functioning, or operating
gather (money or other resources) together over time	move forward, also in the metaphorical sense
bring forth, usually something desirable	continue a certain state, condition, or activity
come up, of celestial bodies
come to the surface
move toward, travel toward something or somebody or approach something or somebody
move upward
get something or somebody for a specific purpose
originate or come into being
be mentioned