gimcrack vs decoration

gimcrack and decoration both are nouns.

Word	Noun	Adjective	Verb	Adverb
gimcrack	Yes	Yes	No	No
decoration	Yes	No	No	No

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

Other hypernyms of gimcrack include ornament, ornamentation.

gimcrack (noun)	decoration (noun)
ornamental objects of no great value	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

gimcrack (adjective)	decoration (adjective)
tastelessly showy