Fomes igniarius vs fungus

Fomes igniarius and fungus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Fomes igniarius	Yes	No	No	No
fungus	Yes	No	No	No

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

Fomes igniarius: fungus used in the preparation of punk for fuses
fungus: an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia

Fomes igniarius (noun)	fungus (noun)
fungus used in the preparation of punk for fuses	an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia