trophy case vs showcase

trophy case and showcase both are nouns.

Word	Noun	Adjective	Verb	Adverb
trophy case	Yes	No	No	No
showcase	Yes	No	No	No

As nouns, showcase is a hypernym of trophy case; that is, showcase is a word with a broader meaning than trophy case:

trophy case: a case in which to display trophies
showcase: a glass container used to store and display items in a shop or museum or home

Other hypernyms of trophy case include case, display case, vitrine.

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