Purple Heart vs laurel wreath

Purple Heart and laurel wreath both are nouns.

Word	Noun	Adjective	Verb	Adverb
Purple Heart	Yes	No	No	No
laurel wreath	Yes	No	No	No

As nouns, laurel wreath is a hypernym of Purple Heart; that is, laurel wreath is a word with a broader meaning than Purple Heart:

Purple Heart: a United States military decoration awarded to any member of the armed forces who is wounded in action
laurel wreath: an award for winning a championship or commemorating some other event

Other hypernyms of Purple Heart include decoration, medal, medallion, palm, ribbon.

Purple Heart (noun)	laurel wreath (noun)
a United States military decoration awarded to any member of the armed forces who is wounded in action	(antiquity) a wreath of laurel foliage worn on the head as an emblem of victory
	an award for winning a championship or commemorating some other event