waste one's time vs stagnate

waste one's time and stagnate both are verbs.

Word	Noun	Adjective	Verb	Adverb
waste one's time	No	No	Yes	No
stagnate	No	No	Yes	No

As verbs, stagnate is a hypernym of waste one's time; that is, stagnate is a word with a broader meaning than waste one's time:

Other hypernyms of waste one's time include idle, laze, slug.

waste one's time (verb)	stagnate (verb)
be lazy or idle	be idle; exist in a changeless situation
	cease to flow; stand without moving
	stand still
	cause to stagnate