necklet vs decoration

necklet and decoration both are nouns.

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

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

necklet: decoration worn about the neck (fur piece or tight necklace) as an ornament
decoration: something used to beautify

Other hypernyms of necklet include ornament, ornamentation.

necklet (noun)	decoration (noun)
decoration worn about the neck (fur piece or tight necklace) as an ornament	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