art class vs course

art class and course both are nouns.

Word	Noun	Adjective	Verb	Adverb
art class	Yes	No	No	No
course	Yes	No	Yes	Yes

As nouns, course is a hypernym of art class; that is, course is a word with a broader meaning than art class:

Other hypernyms of art class include class, course of instruction, course of study.

art class (noun)	course (noun)
a class in which you learn to draw or paint	a mode of action
	education imparted in a series of lessons or meetings
	facility consisting of a circumscribed area of land or water laid out for a sport
	(construction) a layer of masonry
	part of a meal served at one time
	a connected series of events or actions or developments
	a body of students who are taught together
	general line of orientation
	a line or route along which something travels or moves

art class (adverb)	course (adverb)
	as might be expected