hang around vs lounge

hang around is not a noun while lounge is a noun.

Word	Noun	Adjective	Verb	Adverb
hang around	No	No	Yes	No
lounge	Yes	No	Yes	No

As verbs, hang around and lounge are synonyms defined as:

Other synonyms of hang around include footle, lallygag, linger, loaf, loiter, lollygag, lurk, mess about, mill about, mill around, tarry.

hang around (noun)	lounge (noun)
	a room (as in a hotel or airport) with seating where people can wait
	an upholstered seat for more than one person

hang around (verb)	lounge (verb)
be about a place without any apparent purpose	sit or recline comfortably
	be about a place without any apparent purpose