Picus viridis vs peckerwood

Picus viridis and peckerwood both are nouns.

Word	Noun	Adjective	Verb	Adverb
Picus viridis	Yes	No	No	No
peckerwood	Yes	No	No	No

As nouns, peckerwood is a hypernym of Picus viridis; that is, peckerwood is a word with a broader meaning than Picus viridis:

Picus viridis: woodpecker of Europe and western Asia
peckerwood: 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 Picus viridis include pecker, woodpecker.

Picus viridis (noun)	peckerwood (noun)
woodpecker of Europe and western Asia	bird with strong claws and a stiff tail adapted for climbing and a hard chisel-like bill for boring into wood for insects