Fungi vs kingdom Fungi

Fungi and kingdom Fungi both are nouns.

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

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

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

Other synonyms of Fungi include fungus kingdom.

Fungi (noun)	kingdom Fungi (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