clutch vs clench

clutch and clench both are nouns.

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

As nouns, clutch and clench are synonyms defined as:

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

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

clutch (noun)	clench (noun)
the act of grasping	the act of grasping
a coupling that connects or disconnects driving and driven parts of a driving mechanism	a small slip noose made with seizing
a pedal or lever that engages or disengages a rotating shaft and a driving mechanism
a woman's strapless purse that is carried in the hand
a collection of things or persons to be handled together
a number of birds hatched at the same time
a tense critical situation

clutch (verb)	clench (verb)
affect	hold in a tight grasp
take into your hands deliberately	squeeze together tightly
hold firmly, usually with one's hands