ascend vs climb up

ascend and climb up both are verbs.

Word	Noun	Adjective	Verb	Adverb
ascend	No	No	Yes	No
climb up	No	No	Yes	No

As verbs, ascend and climb up are synonyms defined as:

ascend and climb up: appear to be moving upward, as by means of tendrils

ascend (verb)	climb up (verb)
slope upwards	rise in rank or status
travel up	go upward with gradual or continuous progress
come up, of celestial bodies	appear to be moving upward, as by means of tendrils
go along towards (a river's) source
move to a better position in life or to a better job
appear to be moving upward, as by means of tendrils
become king or queen
go back in order of genealogical succession