flicker vs woodpecker

flicker and woodpecker both are nouns.

Word	Noun	Adjective	Verb	Adverb
flicker	Yes	No	Yes	No
woodpecker	Yes	No	No	No

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

flicker: North American woodpecker
woodpecker: 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 flicker include pecker, peckerwood.

flicker (noun)	woodpecker (noun)
the act of moving back and forth	bird with strong claws and a stiff tail adapted for climbing and a hard chisel-like bill for boring into wood for insects
North American woodpecker
a momentary flash of light

flicker (verb)	woodpecker (verb)
move back and forth very rapidly
flash intermittently
shine unsteadily