shelf fungus vs bracket fungus

shelf fungus and bracket fungus both are nouns.

Word	Noun	Adjective	Verb	Adverb
shelf fungus	Yes	No	No	No
bracket fungus	Yes	No	No	No

As nouns, shelf fungus and bracket fungus are synonyms defined as:

shelf fungus and bracket fungus: a woody fungus that forms shelflike sporophores on tree trunks and wood structures

shelf fungus (noun)	bracket fungus (noun)
a woody fungus that forms shelflike sporophores on tree trunks and wood structures	a woody fungus that forms shelflike sporophores on tree trunks and wood structures