grok vs twig

grok is not a noun while twig is a noun.

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

As verbs, twig is a hyponym of grok; that is, twig is a word with a more specific, narrower meaning than grok:

Other hyponyms of grok include figure, catch on, cotton on, get it, get onto, get wise, latch on, tumble, intuit, digest.

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

grok (verb)	twig (verb)
get the meaning of something	branch out in a twiglike manner
	understand, usually after some initial difficulty