field test vs field trial

field test and field trial both are nouns.

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

As nouns, field test and field trial are synonyms defined as:

field test and field trial: a test of the performance of some new product under the conditions in which it will be used

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