downy mildew vs false mildew

downy mildew and false mildew both are nouns.

Word	Noun	Adjective	Verb	Adverb
downy mildew	Yes	No	No	No
false mildew	Yes	No	No	No

As nouns, downy mildew and false mildew are synonyms defined as:

downy mildew and false mildew: any of various fungi of the family Peronosporaceae parasitic on e.g. grapes and potatoes and melons

downy mildew (noun)	false mildew (noun)
any of various fungi of the family Peronosporaceae parasitic on e.g. grapes and potatoes and melons	any of various fungi of the family Peronosporaceae parasitic on e.g. grapes and potatoes and melons