Croix de Guerre vs medallion

Croix de Guerre and medallion both are nouns.

Word	Noun	Adjective	Verb	Adverb
Croix de Guerre	Yes	No	No	No
medallion	Yes	No	No	No

As nouns, medallion is a hypernym of Croix de Guerre; that is, medallion is a word with a broader meaning than Croix de Guerre:

Croix de Guerre: a French military decoration for gallantry
medallion: an award for winning a championship or commemorating some other event

Other hypernyms of Croix de Guerre include decoration, laurel wreath, medal, palm, ribbon.

Croix de Guerre (noun)	medallion (noun)
a French military decoration for gallantry	an award for winning a championship or commemorating some other event
	an emblem indicating that a taxicab is registered
	a circular helping of food (especially a boneless cut of meat)
	a circular helping of food (especially a boneless cut of meat) "medallions of veal"
	any of various large ancient Greek coins