noose vs clench

noose and clench both are nouns.

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

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

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

Other hyponyms of noose include clinch.

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

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