outstay vs stay

outstay is not a noun while stay is a noun.

Word	Noun	Adjective	Verb	Adverb
outstay	No	No	Yes	No
stay	Yes	No	Yes	No

As verbs, stay is a hypernym of outstay; that is, stay is a word with a broader meaning than outstay:

Other hypernyms of outstay include abide, bide.

As verbs, stay is a hypernym of outstay; that is, stay is a word with a broader meaning than outstay:

Other hypernyms of outstay include last out, outride, ride out.

outstay (noun)	stay (noun)
	continuing or remaining in a place or state
	(nautical) brace consisting of a heavy rope or wire cable used as a support for a mast or spar
	a thin strip of metal or bone that is used to stiffen a garment (e.g. a corset)
	a judicial order forbidding some action until an event occurs or the order is lifted
	the state of inactivity following an interruption

outstay (verb)	stay (verb)
stay too long	stay the same; remain in a certain state
surpass in staying power	stop or halt
	overcome or allay
	fasten with stays
	be in a certain place and not leave
	stop a judicial process
	dwell
	continue in a place, position, or situation
	hang on during a trial of endurance