Fungi vs fungus kingdom

Fungi and fungus kingdom both are nouns.

Word	Noun	Adjective	Verb	Adverb
Fungi	Yes	No	No	No
fungus kingdom	Yes	No	No	No

As nouns, Fungi and fungus kingdom are synonyms defined as:

Fungi and fungus kingdom: the taxonomic kingdom including yeast, molds, smuts, mushrooms, and toadstools; distinct from the green plants

Other synonyms of Fungi include kingdom Fungi.

Fungi (noun)	fungus kingdom (noun)
the taxonomic kingdom including yeast, molds, smuts, mushrooms, and toadstools; distinct from the green plants	the taxonomic kingdom including yeast, molds, smuts, mushrooms, and toadstools; distinct from the green plants