joker vs playing card

joker and playing card both are nouns.

Word	Noun	Adjective	Verb	Adverb
joker	Yes	No	No	No
playing card	Yes	No	No	No

As nouns, playing card is a hypernym of joker; that is, playing card is a word with a broader meaning than joker:

joker (noun)	playing card (noun)
a playing card that is usually printed with a picture of a jester	one of a pack of cards that are used to play card games
an inconspicuous clause in a document or bill that affects its meaning in a way that is not immediately apparent
a person who enjoys telling or playing jokes
a person who does something thoughtless or annoying