macrocephaly vs megalocephaly

macrocephaly and megalocephaly both are nouns.

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

As nouns, macrocephaly and megalocephaly are synonyms defined as:

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

Other synonyms of macrocephaly include megacephaly.

macrocephaly (noun)	megalocephaly (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