senior class vs class

senior class and class both are nouns.

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

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

Other hypernyms of senior class include year.

senior class (noun)	class (noun)
final grade or class in high school or college	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

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