communist vs Bolshevist

communist and Bolshevist both are nouns.

Word	Noun	Adjective	Verb	Adverb
communist	Yes	Yes	No	No
Bolshevist	Yes	Yes	No	No

As nouns, Bolshevist is a hyponym of communist; that is, Bolshevist is a word with a more specific, narrower meaning than communist:

communist: a socialist who advocates communism
Bolshevist: a Russian member of the left-wing majority group that followed Lenin and eventually became the Russian communist party

Other hyponyms of communist include apparatchik, Bolshevik, Comrade, revisionist.

communist (noun)	Bolshevist (noun)
a socialist who advocates communism	a Russian member of the left-wing majority group that followed Lenin and eventually became the Russian communist party

communist (adjective)	Bolshevist (adjective)
relating to or marked by communism	of or relating to Bolshevism