apprehend vs twig

apprehend is not a noun while twig is a noun.

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

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

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

apprehend (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

apprehend (verb)	twig (verb)
get the meaning of something	branch out in a twiglike manner
take into custody	understand, usually after some initial difficulty
anticipate with dread or anxiety