appendage vs chelicera

appendage and chelicera both are nouns.

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

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

appendage: an external body part that projects from the body
chelicera: either of the first pair of fang-like appendages near the mouth of an arachnid; often modified for grasping and piercing

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

appendage (noun)	chelicera (noun)
a part that is joined to something larger	either of the first pair of fang-like appendages near the mouth of an arachnid; often modified for grasping and piercing
an external body part that projects from the body
a natural prolongation or projection from a part of an organism either animal or plant