climb up vs ascend

climb up and ascend both are verbs.

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

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

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

climb up (verb)	ascend (verb)
rise in rank or status	slope upwards
go upward with gradual or continuous progress	travel up
appear to be moving upward, as by means of tendrils	come up, of celestial bodies
	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