twig vs furcate

twig is a noun but furcate is not a noun.

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

As verbs, furcate is a hypernym of twig; that is, furcate is a word with a broader meaning than twig:

Other hypernyms of twig include branch, fork, ramify, separate.

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

twig (verb)	furcate (verb)
branch out in a twiglike manner	divide into two or more branches so as to form a fork
understand, usually after some initial difficulty