chela vs extremity

chela and extremity both are nouns.

Word	Noun	Adjective	Verb	Adverb
chela	Yes	No	No	No
extremity	Yes	No	No	No

As nouns, extremity is a hypernym of chela; that is, extremity is a word with a broader meaning than chela:

Other hypernyms of chela include appendage, member.

chela (noun)	extremity (noun)
a Hindu disciple of a swami	an external body part that projects from the body
a grasping structure on the limb of a crustacean or other arthropods	that part of a limb that is farthest from the torso
	the outermost or farthest region or point
	the greatest or utmost degree
	an extreme condition or state (especially of adversity or disease)