bracelet vs jewellery

bracelet and jewellery both are nouns.

Word	Noun	Adjective	Verb	Adverb
bracelet	Yes	No	No	No
jewellery	Yes	No	No	No

As nouns, jewellery is a hypernym of bracelet; that is, jewellery is a word with a broader meaning than bracelet:

bracelet: jewelry worn around the wrist for decoration
jewellery: an adornment (as a bracelet or ring or necklace) made of precious metals and set with gems (or imitation gems)

Other hypernyms of bracelet include jewelry.

bracelet (noun)	jewellery (noun)
jewelry worn around the wrist for decoration	an adornment (as a bracelet or ring or necklace) made of precious metals and set with gems (or imitation gems)
a band of cloth or leather or metal links attached to a wristwatch and wrapped around the wrist