course of lectures vs course

course of lectures and course both are nouns.

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

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

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

course of lectures (noun)	course (noun)
a series of lectures dealing with a subject	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

course of lectures (adverb)	course (adverb)
	as might be expected