downy woodpecker vs pecker

downy woodpecker and pecker both are nouns.

Word	Noun	Adjective	Verb	Adverb
downy woodpecker	Yes	No	No	No
pecker	Yes	No	No	No

As nouns, pecker is a hypernym of downy woodpecker; that is, pecker is a word with a broader meaning than downy woodpecker:

downy woodpecker: small North American woodpecker with black and white plumage and a small bill
pecker: bird with strong claws and a stiff tail adapted for climbing and a hard chisel-like bill for boring into wood for insects

Other hypernyms of downy woodpecker include peckerwood, woodpecker.

downy woodpecker (noun)	pecker (noun)
small North American woodpecker with black and white plumage and a small bill	bird with strong claws and a stiff tail adapted for climbing and a hard chisel-like bill for boring into wood for insects
	horny projecting mouth of a bird
	obscene terms for penis