member vs digit

member and digit both are nouns.

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

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

member: an external body part that projects from the body
digit: a finger or toe in human beings or corresponding body part in other vertebrates

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

member (noun)	digit (noun)
an external body part that projects from the body	a finger or toe in human beings or corresponding body part in other vertebrates
the male sex organ	one of the elements that collectively form a system of numeration
an organization that is a member of another organization (especially a state that belongs to a group of nations)	the length of breadth of a finger used as a linear measure
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