clench vs grasp

clench and grasp both are nouns.

Word	Noun	Adjective	Verb	Adverb
clench	Yes	No	Yes	No
grasp	Yes	No	Yes	No

As nouns, clench and grasp are synonyms defined as:

Other synonyms of clench include clasp, clutch, clutches, grip, hold.

clench (noun)	grasp (noun)
the act of grasping	the act of grasping
a small slip noose made with seizing	an intellectual hold or understanding
	understanding of the nature or meaning or quality or magnitude of something
	the limit of capability

clench (verb)	grasp (verb)
hold in a tight grasp	get the meaning of something
squeeze together tightly	hold firmly