striver vs hard worker

striver and hard worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
striver	Yes	No	No	No
hard worker	Yes	No	No	No

As nouns, striver and hard worker are synonyms defined as:

Other synonyms of striver include slave.

striver (noun)	hard worker (noun)
someone who works as hard as a slave	someone who works as hard as a slave