trial vs field trial

trial and field trial both are nouns.

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

As nouns, field trial is a hyponym of trial; that is, field trial is a word with a more specific, narrower meaning than trial:

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

As nouns, field trial is a hyponym of trial; that is, field trial is a word with a more specific, narrower meaning than trial:

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

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

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