class period vs course

class period and course both are nouns.

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

class period (noun)	course (noun)
a regularly scheduled session as part of a course of study	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

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