shop window vs display window

shop window and display window both are nouns.

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

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

shop 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 shop window include shopwindow, show window.

shop 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