monopoliser vs monopolizer

monopoliser and monopolizer both are nouns.

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

As nouns, monopoliser and monopolizer are synonyms defined as:

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

Other synonyms of monopoliser include monopolist.

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