member vs pincer

member and pincer both are nouns.

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

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

member: an external body part that projects from the body
pincer: a grasping structure on the limb of a crustacean or other arthropods

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

member (noun)	pincer (noun)
an external body part that projects from the body	a grasping structure on the limb of a crustacean or other arthropods
the male sex organ	a hand tool for holding consisting of a compound lever for grasping
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