test copy vs trial impression

test copy and trial impression both are nouns.

Word	Noun	Adjective	Verb	Adverb
test copy	Yes	No	No	No
trial impression	Yes	No	No	No

As nouns, test copy and trial impression are synonyms defined as:

test copy and trial impression: (printing) an impression made to check for errors

Other synonyms of test copy include proof.

test copy (noun)	trial impression (noun)
(printing) an impression made to check for errors	(printing) an impression made to check for errors