sapsucker vs peckerwood

sapsucker and peckerwood both are nouns.

Word	Noun	Adjective	Verb	Adverb
sapsucker	Yes	No	No	No
peckerwood	Yes	No	No	No

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

sapsucker: small American woodpecker that feeds on sap from e.g. apple and maple trees
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 sapsucker include pecker, woodpecker.

sapsucker (noun)	peckerwood (noun)
small American woodpecker that feeds on sap from e.g. apple and maple trees	bird with strong claws and a stiff tail adapted for climbing and a hard chisel-like bill for boring into wood for insects