theatrical poster vs show bill

theatrical poster and show bill both are nouns.

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

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

Other synonyms of theatrical poster include show card.

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