art vs kitsch

art and kitsch both are nouns.

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

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

art: the products of human creativity; works of art collectively
kitsch: excessively garish or sentimental art; usually considered in bad taste

art (noun)	kitsch (noun)
the creation of beautiful or significant things	excessively garish or sentimental art; usually considered in bad taste
the products of human creativity; works of art collectively
a superior skill that you can learn by study and practice and observation
photographs or other visual representations in a printed publication