art vs treasure

art and treasure both are nouns.

Word	Noun	Adjective	Verb	Adverb
art	Yes	No	No	No
treasure	Yes	No	Yes	No

As nouns, treasure is a hyponym of art; that is, treasure is a word with a more specific, narrower meaning than art:

art (noun)	treasure (noun)
the creation of beautiful or significant things	art highly prized for its beauty or perfection
the products of human creativity; works of art collectively	a collection of precious things
a superior skill that you can learn by study and practice and observation	accumulated wealth in the form of money or jewels etc.
photographs or other visual representations in a printed publication	any possession that is highly valued by its owner

art (verb)	treasure (verb)
	be fond of; be attached to
	hold dear