polytonality vs polytonalism

polytonality and polytonalism both are nouns.

Word	Noun	Adjective	Verb	Adverb
polytonality	Yes	No	No	No
polytonalism	Yes	No	No	No

As nouns, polytonality and polytonalism are synonyms defined as:

polytonality and polytonalism: music that uses two or more different keys at the same time

polytonality (noun)	polytonalism (noun)
music that uses two or more different keys at the same time	music that uses two or more different keys at the same time