show card vs theatrical poster

show card and theatrical poster both are nouns.

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

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

Other synonyms of show card include show bill.

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