appendage vs pincer

appendage and pincer both are nouns.

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

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

appendage: 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 appendage include chelicera, mouthpart, fang, chela, claw, nipper, parapodium, fin, pleopod, swimmeret, limb, dactyl, digit.

appendage (noun)	pincer (noun)
a part that is joined to something larger	a grasping structure on the limb of a crustacean or other arthropods
an external body part that projects from the body	a hand tool for holding consisting of a compound lever for grasping
a natural prolongation or projection from a part of an organism either animal or plant