potato blight vs potato mildew

potato blight and potato mildew both are nouns.

Word	Noun	Adjective	Verb	Adverb
potato blight	Yes	No	No	No
potato mildew	Yes	No	No	No

As nouns, potato blight and potato mildew are synonyms defined as:

Other synonyms of potato blight include potato disease, potato mold, potato murrain.

potato blight (noun)	potato mildew (noun)
a blight of potatoes	a blight of potatoes