come up vs come

come up is not a noun while come is a noun.

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

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

come up and come: move toward, travel toward something or somebody or approach something or somebody

come up (noun)	come (noun)
	the thick white fluid containing spermatozoa that is ejaculated by the male genital tract

come up (verb)	come (verb)
result or issue	come to pass; arrive, as in due course
start running, functioning, or operating	be found or available
gather or bring together	reach or enter a state, relation, condition, use, or position
gather (money or other resources) together over time	happen as a result
bring forth, usually something desirable	have a certain priority
come up, of celestial bodies	come to one's mind; suggest itself
come to the surface	move toward, travel toward something or somebody or approach something or somebody
move toward, travel toward something or somebody or approach something or somebody	be received
move upward	cover a certain distance
get something or somebody for a specific purpose	reach a destination; arrive by movement or progress
originate or come into being	experience orgasm
be mentioned	come under, be classified or included
	proceed or get along
	extend or reach
	to be the product or result
	exist or occur in a certain point in a series
	be a native of
	to measure up to in kind or quality
	add up in number or quantity
	come forth
	come from; be connected by a relationship of blood, for example