decor vs ornamentation

decor and ornamentation both are nouns.

Word	Noun	Adjective	Verb	Adverb
decor	Yes	No	No	No
ornamentation	Yes	No	No	No

As nouns, ornamentation is a hypernym of decor; that is, ornamentation is a word with a broader meaning than decor:

decor: decoration consisting of the layout and furnishings of a livable interior
ornamentation: something used to beautify

Other hypernyms of decor include decoration, ornament.

decor (noun)	ornamentation (noun)
decoration consisting of the layout and furnishings of a livable interior	the act of adding extraneous decorations to something
	something used to beautify
	the state of being ornamented