field trial vs trial

field trial and trial both are nouns.

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

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

field trial: a test of young hunting dogs to determine their skill in pointing and retrieving
trial: the act of testing something

Other hypernyms of field trial include run, test.

As nouns, trial is a hypernym of field trial; that is, trial 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
trial: trying something to find out about it

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

field trial (noun)	trial (noun)
a test of young hunting dogs to determine their skill in pointing and retrieving	the act of testing something
a test of the performance of some new product under the conditions in which it will be used	(law) the determination of a person's innocence or guilt by due process of law
a contest between gun dogs to determine their proficiency in pointing and retrieving	the act of undergoing testing
	trying something to find out about it
	an annoying or frustrating or catastrophic event
	(sports) a preliminary competition to determine qualifications