acephalia vs acephaly

acephalia and acephaly both are nouns.

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

As nouns, acephalia and acephaly are synonyms defined as:

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

Other synonyms of acephalia include acephalism.

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