Xylaria mali vs black root rot fungus

Xylaria mali and black root rot fungus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Xylaria mali	Yes	No	No	No
black root rot fungus	Yes	No	No	No

As nouns, Xylaria mali and black root rot fungus are synonyms defined as:

Xylaria mali and black root rot fungus: fungus causing black root rot in apples

Xylaria mali (noun)	black root rot fungus (noun)
fungus causing black root rot in apples	fungus causing black root rot in apples