rhizoctinia vs fungus

rhizoctinia and fungus both are nouns.

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

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

rhizoctinia: any fungus now or formerly belonging to the form genus Rhizoctinia
fungus: an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia

rhizoctinia (noun)	fungus (noun)
any fungus now or formerly belonging to the form genus Rhizoctinia	an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia