struggle vs struggler

struggle and struggler both are nouns.

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

struggle (noun)	struggler (noun)
strenuous effort	a person who struggles with difficulties or with great effort
an energetic attempt to achieve something
an open clash between two opposing groups (or individuals)

struggle (verb)	struggler (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