dowitcher vs greyback

dowitcher and greyback both are nouns.

Word	Noun	Adjective	Verb	Adverb
dowitcher	Yes	No	No	No
greyback	Yes	No	No	No

As nouns, greyback is a hyponym of dowitcher; that is, greyback is a word with a more specific, narrower meaning than dowitcher:

Other hyponyms of dowitcher include grayback, Limnodromus griseus, Limnodromus scolopaceus, red-breasted snipe.

dowitcher (noun)	greyback (noun)
shorebird of the sandpiper family that resembles a snipe	a dowitcher with a grey back
	a sandpiper that breeds in the Arctic and winters in the Southern Hemisphere
	`Johnny' was applied as a nickname for Confederate soldiers by the Federal soldiers in the American Civil War; `greyback' derived from their grey Confederate uniforms