try out vs audition

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

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

As verbs, try out and audition are synonyms defined as:

try out (noun)	audition (noun)
	a test of the suitability of a performer
	the ability to hear; the auditory faculty

try out (verb)	audition (verb)
take a sample of	perform in order to get a role
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