masses vs hoi polloi

masses and hoi polloi both are nouns.

Word	Noun	Adjective	Verb	Adverb
masses	Yes	No	No	No
hoi polloi	Yes	No	No	No

As nouns, masses and hoi polloi are synonyms defined as:

Other synonyms of masses include mass, multitude, people, the great unwashed.

masses (noun)	hoi polloi (noun)
the common people generally	the common people generally