get it vs twig

get it is not a noun while twig is a noun.

Word	Noun	Adjective	Verb	Adverb
get it	No	No	Yes	No
twig	Yes	No	Yes	No

As verbs, get it and twig are synonyms defined as:

Other synonyms of get it include catch on, cotton on, get onto, get wise, latch on, tumble.

get it (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

get it (verb)	twig (verb)
understand, usually after some initial difficulty	branch out in a twiglike manner
receive punishment; be scolded or reprimanded	understand, usually after some initial difficulty