basidiomycetous fungi vs fungus

basidiomycetous fungi and fungus both are nouns.

Word	Noun	Adjective	Verb	Adverb
basidiomycetous fungi	Yes	No	No	No
fungus	Yes	No	No	No

As nouns, fungus is a hypernym of basidiomycetous fungi; that is, fungus is a word with a broader meaning than basidiomycetous fungi:

basidiomycetous fungi: any of various fungi of the subdivision Basidiomycota
fungus: an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia

basidiomycetous fungi (noun)	fungus (noun)
any of various fungi of the subdivision Basidiomycota	an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia