Heterobasidiomycetes vs subclass Heterobasidiomycetes

Heterobasidiomycetes and subclass Heterobasidiomycetes both are nouns.

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

As nouns, Heterobasidiomycetes and subclass Heterobasidiomycetes are synonyms defined as:

Heterobasidiomycetes and subclass Heterobasidiomycetes: category used in some classification systems for various basidiomycetous fungi including rusts and smuts

Heterobasidiomycetes (noun)	subclass Heterobasidiomycetes (noun)
category used in some classification systems for various basidiomycetous fungi including rusts and smuts	category used in some classification systems for various basidiomycetous fungi including rusts and smuts