macrocephaly vs megacephaly

macrocephaly and megacephaly both are nouns.

Word	Noun	Adjective	Verb	Adverb
macrocephaly	Yes	No	No	No
megacephaly	Yes	No	No	No

As nouns, macrocephaly and megacephaly are synonyms defined as:

macrocephaly and megacephaly: an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical

Other synonyms of macrocephaly include megalocephaly.

macrocephaly (noun)	megacephaly (noun)
an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical	an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical