As nouns the difference between trial and check
is that
trial is an opportunity to test something out; a test while
check is (chess) a situation in which the king is directly threatened by an opposing piece or
check can be (textiles|usually|pluralized) a pattern made up of a grid of squares of alternating colors; a checkered pattern.
As verbs the difference between trial and check
is that
trial is to carry out a series of tests on (a new product, procedure etc) before marketing or implementing it while
check is to inspect; to examine.
As an adjective trial
is pertaining to a trial or test or
trial can be characterized by having three (usually equivalent) components.