Tremella vs fungus genus

Tremella and fungus genus both are nouns.

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

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

Tremella: fungi with yellowish gelatinous sporophores having convolutions resembling those of the brain
fungus genus: includes lichen genera

Tremella (noun)	fungus genus (noun)
fungi with yellowish gelatinous sporophores having convolutions resembling those of the brain	includes lichen genera