spot-check vs spot check

spot-check is not a noun while spot check is a noun.

Word	Noun	Adjective	Verb	Adverb
spot-check	No	No	Yes	No
spot check	Yes	No	No	No

spot-check (noun)	spot check (noun)
	a check on work performance or product quality made at random times without warning

spot-check (verb)	spot check (verb)
pick out random samples for examination in order to ensure high quality