showcase vs show window

showcase and show window both are nouns.

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

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

showcase and show window: a setting in which something can be displayed to best effect

showcase (noun)	show window (noun)
a glass container used to store and display items in a shop or museum or home	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	a setting in which something can be displayed to best effect