potato murrain vs potato blight

potato murrain and potato blight both are nouns.

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

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

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

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