Melanerpes erythrocephalus vs redhead

Melanerpes erythrocephalus and redhead both are nouns.

Word	Noun	Adjective	Verb	Adverb
Melanerpes erythrocephalus	Yes	No	No	No
redhead	Yes	No	No	No

As nouns, Melanerpes erythrocephalus and redhead are synonyms defined as:

Melanerpes erythrocephalus and redhead: black-and-white North American woodpecker having a red head and neck

Other synonyms of Melanerpes erythrocephalus include redheaded woodpecker.

Melanerpes erythrocephalus (noun)	redhead (noun)
black-and-white North American woodpecker having a red head and neck	black-and-white North American woodpecker having a red head and neck
	North American diving duck with a grey-and-black body and reddish-brown head
	someone who has red hair