Polychaeta vs class

Polychaeta and class both are nouns.

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

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

Polychaeta (noun)	class (noun)
marine annelid worms	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

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