shop window vs show window

shop window and show window both are nouns.

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

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

shop window and show 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 display window, shopwindow.

shop window (noun)	show 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