withy vs sprig

withy and sprig both are nouns.

Word	Noun	Adjective	Verb	Adverb
withy	Yes	No	No	No
sprig	Yes	No	No	No

As nouns, sprig is a hypernym of withy; that is, sprig is a word with a broader meaning than withy:

withy: strong flexible twig
sprig: a small branch or division of a branch (especially a terminal division); usually applied to branches of the current or preceding year

Other hypernyms of withy include branchlet, twig.

withy (noun)	sprig (noun)
strong flexible twig	an ornament that resembles a spray of leaves or flowers
	a small branch or division of a branch (especially a terminal division); usually applied to branches of the current or preceding year