graffiti vs decoration

graffiti and decoration both are nouns.

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

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

Other hypernyms of graffiti include ornament, ornamentation.

graffiti (noun)	decoration (noun)
a rude decoration inscribed on rocks or walls	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