workout vs work out

workout is a noun but work out is not a noun.

Word	Noun	Adjective	Verb	Adverb
workout	Yes	No	No	No
work out	No	No	Yes	No

workout (noun)	work out (noun)
the activity of exerting your muscles in various ways to keep fit

workout (verb)	work out (verb)
	do physical exercise
	give a workout to
	come up with
	work out in detail
	find the solution to (a problem or question) or understand the meaning of
	make a mathematical calculation or computation
	be calculated
	happen in a certain way, leading to, producing, or resulting in a certain outcome, often well