Basidiomycetes vs class Basidiomycetes

Basidiomycetes and class Basidiomycetes both are nouns.

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

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

Basidiomycetes and class Basidiomycetes: large class of higher fungi coextensive with subdivision Basidiomycota

Basidiomycetes (noun)	class Basidiomycetes (noun)
large class of higher fungi coextensive with subdivision Basidiomycota	large class of higher fungi coextensive with subdivision Basidiomycota