jewelry vs jewellery

jewelry and jewellery both are nouns.

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

As nouns, jewelry and jewellery are synonyms defined as:

jewelry and jewellery: an adornment (as a bracelet or ring or necklace) made of precious metals and set with gems (or imitation gems)

jewelry (noun)	jewellery (noun)
an adornment (as a bracelet or ring or necklace) made of precious metals and set with gems (or imitation gems)	an adornment (as a bracelet or ring or necklace) made of precious metals and set with gems (or imitation gems)