struggle vs oppose

struggle is a noun but oppose is not a noun.

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

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

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

struggle (verb)	oppose (verb)
be engaged in a fight; carry on a fight	be resistant to
to exert strenuous effort against opposition	be against; express opposition to
climb awkwardly, as if by scrambling	set into opposition or rivalry
make a strenuous or labored effort	fight against or resist strongly
	act against or in opposition to
	contrast with equal weight or force