subsidizer vs subsidiser

subsidizer and subsidiser both are nouns.

Word	Noun	Adjective	Verb	Adverb
subsidizer	Yes	No	No	No
subsidiser	Yes	No	No	No

As nouns, subsidizer and subsidiser are synonyms defined as:

subsidizer and subsidiser: someone who assists or supports by giving a subsidy

subsidizer (noun)	subsidiser (noun)
someone who assists or supports by giving a subsidy	someone who assists or supports by giving a subsidy