true fungus vs fungus

true fungus and fungus both are nouns.

Word	Noun	Adjective	Verb	Adverb
true fungus	Yes	No	No	No
fungus	Yes	No	No	No

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

true fungus: any of numerous fungi of the division Eumycota
fungus: an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia

true fungus (noun)	fungus (noun)
any of numerous fungi of the division Eumycota	an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia