display window vs shop window

display window and shop window both are nouns.

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

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

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

Other synonyms of display window include shopwindow, show window.

display window (noun)	shop 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