clench vs noose

clench and noose both are nouns.

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

As nouns, noose is a hypernym of clench; that is, noose is a word with a broader meaning than clench:

clench: a small slip noose made with seizing
noose: a loop formed in a cord or rope by means of a slipknot; it binds tighter as the cord or rope is pulled

Other hypernyms of clench include running noose, slip noose.

clench (noun)	noose (noun)
the act of grasping	a trap for birds or small mammals; often has a slip noose
a small slip noose made with seizing	a loop formed in a cord or rope by means of a slipknot; it binds tighter as the cord or rope is pulled

clench (verb)	noose (verb)
hold in a tight grasp	secure with a noose
squeeze together tightly	make a noose in or of