redhead vs redheaded woodpecker

redhead and redheaded woodpecker both are nouns.

Word	Noun	Adjective	Verb	Adverb
redhead	Yes	No	No	No
redheaded woodpecker	Yes	No	No	No

As nouns, redhead and redheaded woodpecker are synonyms defined as:

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

Other synonyms of redhead include Melanerpes erythrocephalus.

redhead (noun)	redheaded woodpecker (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