flax rust vs Melampsora lini

flax rust and Melampsora lini both are nouns.

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

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

Other synonyms of flax rust include flax rust fungus.

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