arse about vs idle

arse about is not a noun while idle is a noun.

Word	Noun	Adjective	Verb	Adverb
arse about	No	No	Yes	No
idle	Yes	Yes	Yes	No

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

Other hypernyms of arse about include laze, slug, stagnate.

arse about (noun)	idle (noun)
	the state of an engine or other mechanism that is idling

arse about (adjective)	idle (adjective)
	not in action or at work
	silly or trivial
	not in active use
	lacking a sense of restraint or responsibility
	not having a job
	not yielding a return
	without a basis in reason or fact

arse about (verb)	idle (verb)
be lazy or idle	run disconnected or idle
	be idle; exist in a changeless situation