struggle vs tussle

struggle and tussle both are nouns.

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

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

struggle (noun)	tussle (noun)
strenuous effort	disorderly fighting
an energetic attempt to achieve something
an open clash between two opposing groups (or individuals)

struggle (verb)	tussle (verb)
be engaged in a fight; carry on a fight	make messy or untidy
to exert strenuous effort against opposition	fight or struggle in a confused way at close quarters
climb awkwardly, as if by scrambling
make a strenuous or labored effort