class Basidiomycetes vs subclass Heterobasidiomycetes

class Basidiomycetes and subclass Heterobasidiomycetes both are nouns.

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

class Basidiomycetes (noun)	subclass Heterobasidiomycetes (noun)
large class of higher fungi coextensive with subdivision Basidiomycota	category used in some classification systems for various basidiomycetous fungi including rusts and smuts