extremity vs parapodium

extremity and parapodium both are nouns.

Word	Noun	Adjective	Verb	Adverb
extremity	Yes	No	No	No
parapodium	Yes	No	No	No

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

extremity: an external body part that projects from the body
parapodium: one of a pair of fleshy appendages of a polychete annelid that functions in locomotion and breathing

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

extremity (noun)	parapodium (noun)
an external body part that projects from the body	one of a pair of fleshy appendages of a polychete annelid that functions in locomotion and breathing
that part of a limb that is farthest from the torso
the outermost or farthest region or point
the greatest or utmost degree
an extreme condition or state (especially of adversity or disease)