black root rot fungus vs Xylaria mali

black root rot fungus and Xylaria mali both are nouns.

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

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

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

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