show window vs display window

show window and display window both are nouns.

Word	Noun	Adjective	Verb	Adverb
show window	Yes	No	No	No
display window	Yes	No	No	No

As nouns, show window and display window are synonyms defined as:

show window and display window: a window of a store facing onto the street; used to display merchandise for sale in the store

Other synonyms of show window include shop window, shopwindow.

show window (noun)	display window (noun)
a window of a store facing onto the street; used to display merchandise for sale in the store	a window of a store facing onto the street; used to display merchandise for sale in the store
a setting in which something can be displayed to best effect