trial vs endeavor

trial and endeavor both are nouns.

Word	Noun	Adjective	Verb	Adverb
trial	Yes	No	No	No
endeavor	Yes	No	Yes	No

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

trial: the act of testing something
endeavor: earnest and conscientious activity intended to do or accomplish something

Other hypernyms of trial include attempt, effort, endeavour, try.

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

trial: the act of undergoing testing
endeavor: earnest and conscientious activity intended to do or accomplish something

Other hypernyms of trial include attempt, effort, endeavour, try.

trial (noun)	endeavor (noun)
the act of testing something	earnest and conscientious activity intended to do or accomplish something
(law) the determination of a person's innocence or guilt by due process of law	a purposeful or industrious undertaking (especially one that requires effort or boldness)
the act of undergoing testing
trying something to find out about it
an annoying or frustrating or catastrophic event
(sports) a preliminary competition to determine qualifications

trial (verb)	endeavor (verb)
	attempt by employing effort