grasp vs get it

grasp is a noun but get it is not a noun.

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

As verbs, get it is a hyponym of grasp; that is, get it is a word with a more specific, narrower meaning than grasp:

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

grasp (noun)	get it (noun)
the act of grasping
an intellectual hold or understanding
understanding of the nature or meaning or quality or magnitude of something
the limit of capability

grasp (verb)	get it (verb)
get the meaning of something	understand, usually after some initial difficulty
hold firmly	receive punishment; be scolded or reprimanded