member vs penis

member and penis both are nouns.

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

As nouns, member and penis are synonyms defined as:

Other synonyms of member include phallus.

member (noun)	penis (noun)
an external body part that projects from the body	the male sex organ
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