course of lectures vs class

course of lectures and class both are nouns.

Word	Noun	Adjective	Verb	Adverb
course of lectures	Yes	No	No	No
class	Yes	No	Yes	No

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

Other hypernyms of course of lectures include course, course of instruction, course of study.

course of lectures (noun)	class (noun)
a series of lectures dealing with a subject	education imparted in a series of lessons or meetings
	elegance in dress or behavior
	a collection of things sharing a common attribute
	people having the same social, economic, or educational status
	(biology) a taxonomic group containing one or more orders
	a body of students who are taught together
	a body of students who graduate together
	a league ranked by quality

course of lectures (verb)	class (verb)
	arrange or order by classes or categories