tryout vs road test

tryout and road test both are nouns.

Word	Noun	Adjective	Verb	Adverb
tryout	Yes	No	No	No
road test	Yes	No	No	No

As nouns, road test is a hyponym of tryout; that is, road test is a word with a more specific, narrower meaning than tryout:

Other hyponyms of tryout include field test, field trial, alpha test, beta test, trial balloon.

tryout (noun)	road test (noun)
a test of the suitability of a performer	a test to insure that a vehicle is roadworthy
trying something to find out about it