field trial vs tryout

field trial and tryout both are nouns.

Word	Noun	Adjective	Verb	Adverb
field trial	Yes	No	No	No
tryout	Yes	No	No	No

As nouns, tryout is a hypernym of field trial; that is, tryout is a word with a broader meaning than field trial:

field trial: a test of the performance of some new product under the conditions in which it will be used
tryout: trying something to find out about it

Other hypernyms of field trial include test, trial, trial run.

field trial (noun)	tryout (noun)
a test of young hunting dogs to determine their skill in pointing and retrieving	a test of the suitability of a performer
a test of the performance of some new product under the conditions in which it will be used	trying something to find out about it
a contest between gun dogs to determine their proficiency in pointing and retrieving