atonalism vs atonality

atonalism and atonality both are nouns.

Word	Noun	Adjective	Verb	Adverb
atonalism	Yes	No	No	No
atonality	Yes	No	No	No

As nouns, atonalism and atonality are synonyms defined as:

atonalism and atonality: the absence of a key; alternative to the diatonic system

atonalism (noun)	atonality (noun)
the absence of a key; alternative to the diatonic system	the absence of a key; alternative to the diatonic system