macrocephalic vs macrocephalous

macrocephalic and macrocephalous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
macrocephalic	No	Yes	No	No
macrocephalous	No	Yes	No	No

As adjectives, macrocephalic and macrocephalous are synonyms defined as:

macrocephalic and macrocephalous: having an exceptionally large head and brain

macrocephalic (adjective)	macrocephalous (adjective)
having an exceptionally large head and brain	having an exceptionally large head and brain