effort vs struggle

effort and struggle both are nouns.

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

As nouns, struggle is a hyponym of effort; that is, struggle is a word with a more specific, narrower meaning than effort:

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

As nouns, struggle is a hyponym of effort; that is, struggle is a word with a more specific, narrower meaning than effort:

effort (noun)	struggle (noun)
earnest and conscientious activity intended to do or accomplish something	strenuous effort
use of physical or mental energy; hard work	an energetic attempt to achieve something
a notable achievement	an open clash between two opposing groups (or individuals)
a series of actions advancing a principle or tending toward a particular end

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