wrestling vs struggle

wrestling and struggle both are nouns.

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

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

wrestling (noun)	struggle (noun)
the sport of hand-to-hand struggle between unarmed contestants who try to throw each other down	strenuous effort
the act of engaging in close hand-to-hand combat	an energetic attempt to achieve something
	an open clash between two opposing groups (or individuals)

wrestling (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