Silver Star Medal vs decoration

Silver Star Medal and decoration both are nouns.

Word	Noun	Adjective	Verb	Adverb
Silver Star Medal	Yes	No	No	No
decoration	Yes	No	No	No

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

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

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

Silver Star Medal (noun)	decoration (noun)
a United States military decoration for gallantry in action	the act of decorating something (in the hope of making it more attractive)
	something used to beautify
	an award for winning a championship or commemorating some other event