course vs course session

course and course session both are nouns.

Word	Noun	Adjective	Verb	Adverb
course	Yes	No	Yes	Yes
course session	Yes	No	No	No

course (noun)	course session (noun)
a mode of action	a regularly scheduled session as part of a course of study
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 (adverb)	course session (adverb)
as might be expected