genus Amanita vs fungus genus

genus Amanita and fungus genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Amanita	Yes	No	No	No
fungus genus	Yes	No	No	No

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

genus Amanita: genus of widely distributed agarics that have white spores and are poisonous with few exceptions
fungus genus: includes lichen genera

genus Amanita (noun)	fungus genus (noun)
genus of widely distributed agarics that have white spores and are poisonous with few exceptions	includes lichen genera