window dressing vs decoration

window dressing and decoration both are nouns.

Word	Noun	Adjective	Verb	Adverb
window dressing	Yes	No	No	No
decoration	Yes	No	No	No

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

window dressing: the decoration of shop windows
decoration: the act of decorating something (in the hope of making it more attractive)

window dressing (noun)	decoration (noun)
the decoration of shop windows	the act of decorating something (in the hope of making it more attractive)
a showy misrepresentation intended to conceal something unpleasant	something used to beautify
	an award for winning a championship or commemorating some other event