Purple Heart vs ribbon

Purple Heart and ribbon both are nouns.

Word	Noun	Adjective	Verb	Adverb
Purple Heart	Yes	No	No	No
ribbon	Yes	No	No	No

As nouns, ribbon is a hypernym of Purple Heart; that is, ribbon 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
ribbon: an award for winning a championship or commemorating some other event

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

Purple Heart (noun)	ribbon (noun)
a United States military decoration awarded to any member of the armed forces who is wounded in action	notion consisting of a narrow strip of fine material used for trimming
	a long strip of inked material for making characters on paper with a typewriter
	an award for winning a championship or commemorating some other event
	any long object resembling a thin line