Melampsora lini vs flax rust fungus

Melampsora lini and flax rust fungus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Melampsora lini	Yes	No	No	No
flax rust fungus	Yes	No	No	No

As nouns, Melampsora lini and flax rust fungus are synonyms defined as:

Other synonyms of Melampsora lini include flax rust.

Melampsora lini (noun)	flax rust fungus (noun)
fungus causing flax rust	fungus causing flax rust