monopolist vs monopoliser

monopolist and monopoliser both are nouns.

Word	Noun	Adjective	Verb	Adverb
monopolist	Yes	No	No	No
monopoliser	Yes	No	No	No

As nouns, monopolist and monopoliser are synonyms defined as:

monopolist and monopoliser: someone who monopolizes the means of producing or selling something

Other synonyms of monopolist include monopolizer.

monopolist (noun)	monopoliser (noun)
someone who monopolizes the means of producing or selling something	someone who monopolizes the means of producing or selling something