member vs parapodium

member and parapodium both are nouns.

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

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

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

member (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
the male sex organ
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