arse around vs stagnate

arse around and stagnate both are verbs.

Word	Noun	Adjective	Verb	Adverb
arse around	No	No	Yes	No
stagnate	No	No	Yes	No

As verbs, stagnate is a hypernym of arse around; that is, stagnate is a word with a broader meaning than arse around:

Other hypernyms of arse around include idle, laze, slug.

arse around (verb)	stagnate (verb)
indulge in horseplay	be idle; exist in a changeless situation
be lazy or idle	cease to flow; stand without moving
	stand still
	cause to stagnate