grab vs snap up

grab is a noun but snap up is not a noun.

Word	Noun	Adjective	Verb	Adverb
grab	Yes	No	Yes	No
snap up	No	No	Yes	No

As verbs, grab and snap up are synonyms defined as:

Other synonyms of grab include snaffle.

grab (noun)	snap up (noun)
the act of catching an object with the hands
a mechanical device for gripping an object

grab (verb)	snap up (verb)
capture the attention or imagination of	get hold of or seize quickly and easily
take hold of so as to seize or restrain or stop the motion of
take or grasp suddenly
make a grasping or snatching motion with the hand
get hold of or seize quickly and easily
obtain illegally or unscrupulously