card vs membership card

card and membership card both are nouns.

Word	Noun	Adjective	Verb	Adverb
card	Yes	No	Yes	No
membership card	Yes	No	No	No

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

Other hyponyms of card include business card, donor card, keycard, borrower's card, library card, ration card.

card (noun)	membership card (noun)
one of a set of small pieces of stiff paper marked in various ways and used for playing games or for telling fortunes	a card certifying membership in an organization
a printed circuit that can be inserted into expansion slots in a computer to increase the computer's capabilities
a rectangular piece of stiff paper used to send messages (may have printed greetings or pictures)
a card certifying the identity of the bearer
a sign posted in a public place as an advertisement
(baseball) a list of batters in the order in which they will bat
a printed or written greeting that is left to indicate that you have visited
a list of dishes available at a restaurant
(golf) a record of scores (as in golf)
a witty amusing person who makes jokes
thin cardboard, usually rectangular

card (verb)	membership card (verb)
ask someone for identification to determine whether he or she is old enough to consume liquor
separate the fibers of