appendage vs fang

appendage and fang both are nouns.

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

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

appendage: an external body part that projects from the body
fang: an appendage of insects that is capable of injecting venom; usually evolved from the legs

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

appendage (noun)	fang (noun)
a part that is joined to something larger	hollow or grooved tooth of a venomous snake; used to inject its poison
an external body part that projects from the body	canine tooth of a carnivorous animal; used to seize and tear its prey
a natural prolongation or projection from a part of an organism either animal or plant	an appendage of insects that is capable of injecting venom; usually evolved from the legs