kingdom Fungi vs Fungi

kingdom Fungi and Fungi both are nouns.

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

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

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

Other synonyms of kingdom Fungi include fungus kingdom.

kingdom Fungi (noun)	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