shop window vs shopwindow

shop window and shopwindow both are nouns.

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

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

shop window and shopwindow: 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, show window.

shop window (noun)	shopwindow (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