experiment vs trial run

experiment and trial run both are nouns.

Word	Noun	Adjective	Verb	Adverb
experiment	Yes	No	Yes	No
trial run	Yes	No	No	No

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

Other hyponyms of experiment include pilot experiment, test, trial, tryout.

experiment (noun)	trial run (noun)
the act of conducting a controlled test or investigation	trying something to find out about it
a venture at something new or different
the testing of an idea

experiment (verb)	trial run (verb)
to conduct a test or investigation
try something new, as in order to gain experience