go up vs mountaineer

go up is not a noun while mountaineer is a noun.

Word	Noun	Adjective	Verb	Adverb
go up	No	No	Yes	No
mountaineer	Yes	No	Yes	No

As verbs, mountaineer is a hyponym of go up; that is, mountaineer is a word with a more specific, narrower meaning than go up:

Other hyponyms of go up include scale, escalade, ramp, ride.

go up (noun)	mountaineer (noun)
	someone who climbs mountains

go up (verb)	mountaineer (verb)
increase in value or to a higher point	climb mountains for pleasure as a sport
burn completely; be consumed or destroyed by fire
move upward
go upward with gradual or continuous progress
be erected, built, or constructed
move towards
travel up