Silver Star vs ribbon

Silver Star and ribbon both are nouns.

Word	Noun	Adjective	Verb	Adverb
Silver Star	Yes	No	No	No
ribbon	Yes	No	No	No

As nouns, ribbon is a hypernym of Silver Star; that is, ribbon is a word with a broader meaning than Silver Star:

Silver Star: a United States military decoration for gallantry in action
ribbon: an award for winning a championship or commemorating some other event

Other hypernyms of Silver Star include decoration, laurel wreath, medal, medallion, palm.

Silver Star (noun)	ribbon (noun)
a United States military decoration for gallantry 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