lunula vs decoration

lunula and decoration both are nouns.

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

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

Other hypernyms of lunula include ornament, ornamentation.

lunula (noun)	decoration (noun)
a crescent-shaped metal ornament of the Bronze Age	the act of decorating something (in the hope of making it more attractive)
the crescent-shaped area at the base of the human fingernail	something used to beautify
	an award for winning a championship or commemorating some other event