acephalia vs acephalism

acephalia and acephalism both are nouns.

Word	Noun	Adjective	Verb	Adverb
acephalia	Yes	No	No	No
acephalism	Yes	No	No	No

As nouns, acephalia and acephalism are synonyms defined as:

acephalia and acephalism: absence of the head (as in the development of some monsters)

Other synonyms of acephalia include acephaly.

acephalia (noun)	acephalism (noun)
absence of the head (as in the development of some monsters)	absence of the head (as in the development of some monsters)