false mildew vs downy mildew

false mildew and downy mildew both are nouns.

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

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

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

false mildew (noun)	downy 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