theatrical poster vs show card

theatrical poster and show card both are nouns.

Word	Noun	Adjective	Verb	Adverb
theatrical poster	Yes	No	No	No
show card	Yes	No	No	No

As nouns, theatrical poster and show card are synonyms defined as:

Other synonyms of theatrical poster include show bill.

theatrical poster (noun)	show card (noun)
a poster advertising a show or play	a poster advertising a show or play