fistfight vs struggle

fistfight and struggle both are nouns.

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

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

Other hypernyms of fistfight include contend, fight.

fistfight (noun)	struggle (noun)
a fight with bare fists	strenuous effort
	an energetic attempt to achieve something
	an open clash between two opposing groups (or individuals)

fistfight (verb)	struggle (verb)
fight with the fists	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