choker vs necklace

choker and necklace both are nouns.

Word	Noun	Adjective	Verb	Adverb
choker	Yes	No	No	No
necklace	Yes	No	No	No

As nouns, necklace is a hypernym of choker; that is, necklace is a word with a broader meaning than choker:

choker: necklace that fits tightly around a woman's neck
necklace: jewelry consisting of a cord or chain (often bearing gems) worn about the neck as an ornament (especially by women)

choker (noun)	necklace (noun)
a high tight collar	jewelry consisting of a cord or chain (often bearing gems) worn about the neck as an ornament (especially by women)
necklace that fits tightly around a woman's neck
someone who kills by strangling
an unfortunate person who is unable to perform effectively because of nervous tension or agitation