try out vs tryout

try out is not a noun while tryout is a noun.

Word	Noun	Adjective	Verb	Adverb
try out	No	No	Yes	No
tryout	Yes	No	No	No

try out (noun)	tryout (noun)
	a test of the suitability of a performer
	trying something to find out about it

try out (verb)	tryout (verb)
take a sample of
perform in order to get a role
put to the test, as for its quality, or give experimental use to
try something new, as in order to gain experience