serial music vs serialism

serial music and serialism both are nouns.

Word	Noun	Adjective	Verb	Adverb
serial music	Yes	No	No	No
serialism	Yes	No	No	No

As nouns, serial music and serialism are synonyms defined as:

serial music and serialism: 20th century music that uses a definite order of notes as a thematic basis for a musical composition

serial music (noun)	serialism (noun)
20th century music that uses a definite order of notes as a thematic basis for a musical composition	20th century music that uses a definite order of notes as a thematic basis for a musical composition