stay vs keep

stay and keep both are nouns.

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

As verbs, keep is a hyponym of stay; that is, keep is a word with a more specific, narrower meaning than stay:

Other hyponyms of stay include keep out, sit tight, stay together, stick together, stand, stay fresh, be.

stay (noun)	keep (noun)
continuing or remaining in a place or state	the main tower within the walls of a medieval castle or fortress
(nautical) brace consisting of a heavy rope or wire cable used as a support for a mast or spar	a cell in a jail or prison
a thin strip of metal or bone that is used to stiffen a garment (e.g. a corset)	the financial means whereby one lives
a judicial order forbidding some action until an event occurs or the order is lifted
the state of inactivity following an interruption

stay (verb)	keep (verb)
stay the same; remain in a certain state	prevent (food) from rotting
stop or halt	prevent the action or expression of
overcome or allay	stick to correctly or closely
fasten with stays	maintain by writing regular records
be in a certain place and not leave	supply with necessities and support
stop a judicial process	hold and prevent from leaving
dwell	retain possession of
continue in a place, position, or situation	look after; be the keeper of; have charge of
hang on during a trial of endurance	retain rights to
	maintain for use and service
	have as a supply
	store or keep customarily
	stop (someone or something) from doing something or being in a certain state
	allow to remain in a place or position or maintain a property or feature
	conform one's action or practice to
	behave as expected during of holidays or rites
	cause to continue in a certain state, position, or activity
	supply with room and board
	maintain in safety from injury, harm, or danger
	fail to spoil or rot
	continue a certain state, condition, or activity
	to rear