seminar vs class

seminar and class both are nouns.

Word	Noun	Adjective	Verb	Adverb
seminar	Yes	No	No	No
class	Yes	No	Yes	No

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

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

seminar (noun)	class (noun)
a course offered for a small group of advanced students	education imparted in a series of lessons or meetings
any meeting for an exchange of ideas	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

seminar (verb)	class (verb)
	arrange or order by classes or categories