megacephaly vs megalocephaly

megacephaly and megalocephaly both are nouns.

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

As nouns, megacephaly and megalocephaly are synonyms defined as:

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

Other synonyms of megacephaly include macrocephaly.

megacephaly (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