struggle vs endeavor

struggle and endeavor both are nouns.

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

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

struggle: an energetic attempt to achieve something
endeavor: earnest and conscientious activity intended to do or accomplish something

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

As verbs, endeavor is a hypernym of struggle; that is, endeavor is a word with a broader meaning than struggle:

Other hypernyms of struggle include endeavour, strive.

struggle (noun)	endeavor (noun)
strenuous effort	earnest and conscientious activity intended to do or accomplish something
an energetic attempt to achieve something	a purposeful or industrious undertaking (especially one that requires effort or boldness)
an open clash between two opposing groups (or individuals)

struggle (verb)	endeavor (verb)
be engaged in a fight; carry on a fight	attempt by employing effort
to exert strenuous effort against opposition
climb awkwardly, as if by scrambling
make a strenuous or labored effort