necklet vs ornamentation

necklet and ornamentation both are nouns.

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

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

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

Other hypernyms of necklet include decoration, ornament.

necklet (noun)	ornamentation (noun)
decoration worn about the neck (fur piece or tight necklace) as an ornament	the act of adding extraneous decorations to something
	something used to beautify
	the state of being ornamented