warm-up vs warm up

warm-up and warm up both are nouns.

Word	Noun	Adjective	Verb	Adverb
warm-up	Yes	No	No	No
warm up	Yes	No	Yes	No

warm-up (noun)	warm up (noun)
exercising in preparation for strenuous activity	performing mild exercises to prepare for some more strenuous activity

warm-up (verb)	warm up (verb)
	make one's body limber or suppler by stretching, as if to prepare for strenuous physical activity
	cause to do preliminary exercises so as to stretch the muscles
	get warm or warmer
	become more friendly or open
	run until the normal working temperature is reached