accessory vs wearable

accessory and wearable both are nouns.

Word	Noun	Adjective	Verb	Adverb
accessory	Yes	Yes	No	No
wearable	Yes	Yes	No	No

As nouns, wearable is a hypernym of accessory; that is, wearable is a word with a broader meaning than accessory:

accessory: clothing that is worn or carried, but not part of your main clothing
wearable: a covering designed to be worn on a person's body

Other hypernyms of accessory include article of clothing, clothing, habiliment, vesture, wear.

accessory (noun)	wearable (noun)
a supplementary component that improves capability	a covering designed to be worn on a person's body
clothing that is worn or carried, but not part of your main clothing
someone who helps another person commit a crime

accessory (adjective)	wearable (adjective)
furnishing added support	suitable for wear or able to be worn
aiding and abetting in a crime