What type of noun is the word art?

The noun art is a common noun, a Word for any art of any kind.

The noun art is an singular, uncountable, abstract noun as a Word for something that people feel has value because it is beautiful or expresses ideas.

The noun art is a singular, uncountable, concrete noun as a Word for paintings, drawings, and sculptures that are created to be beautiful or to express ideas.

The noun arts is a plural, uncountable, abstract noun as a Word for activities such as art, music, film, theater, and dance, considered together; subjects of study that are not scientific, such as history, literature, and languages.

The noun art is a singular, countable, abstract noun as a Word for an activity that needs special skills or knowledge (the art of glass blowing, the art of embroidery, the arts of writing and performing, etc.)

The noun Art (capital A) is a singular, propernoun as the name of a person, often the nickname for the name Arthur.