member vs nipper

member and nipper both are nouns.

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

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

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

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

member (noun)	nipper (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 young person of either sex
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