trial run vs experiment

trial run and experiment both are nouns.

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

As nouns, experiment is a hypernym of trial run; that is, experiment is a word with a broader meaning than trial run:

Other hypernyms of trial run include experimentation.

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

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