orientation course vs class

orientation course and class both are nouns.

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

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

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

orientation course (noun)	class (noun)
a course introducing a new situation or environment	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

orientation course (verb)	class (verb)
	arrange or order by classes or categories