Polyplacophora vs class Polyplacophora

Polyplacophora and class Polyplacophora both are nouns.

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

As nouns, Polyplacophora and class Polyplacophora are synonyms defined as:

Polyplacophora and class Polyplacophora: small class of marine mollusks comprising the chitons; sometimes considered an order of the subclass Amphineura

Polyplacophora (noun)	class Polyplacophora (noun)
small class of marine mollusks comprising the chitons; sometimes considered an order of the subclass Amphineura	small class of marine mollusks comprising the chitons; sometimes considered an order of the subclass Amphineura