member vs chela

member and chela both are nouns.

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

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

Other hyponyms of member include chelicera, mouthpart, fang, claw, nipper, pincer, parapodium, fin, pleopod, swimmeret, limb, dactyl, digit.

member (noun)	chela (noun)
an external body part that projects from the body	a Hindu disciple of a swami
the male sex organ	a grasping structure on the limb of a crustacean or other arthropods
an organization that is a member of another organization (especially a state that belongs to a group of nations)
one of the persons who compose a social group (especially individuals who have joined and participate in a group organization)
anything that belongs to a set or class