erection vs member

erection and member both are nouns.

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

As nouns, member is a hypernym of erection; that is, member is a word with a broader meaning than erection:

Other hypernyms of erection include penis, phallus.

erection (noun)	member (noun)
the act of building or putting up	an external body part that projects from the body
a structure that has been erected	the male sex organ
an erect penis	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