shopwindow vs shop window

shopwindow and shop window both are nouns.

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

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

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

Other synonyms of shopwindow include display window, show window.

shopwindow (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