withy vs twig

withy and twig both are nouns.

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

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

withy: strong flexible twig
twig: 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, sprig.

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

withy (verb)	twig (verb)
	branch out in a twiglike manner
	understand, usually after some initial difficulty