duff vs plum duff

duff and plum duff both are nouns.

Word	Noun	Adjective	Verb	Adverb
duff	Yes	No	No	No
plum duff	Yes	No	No	No

As nouns, duff and plum duff are synonyms defined as:

duff and plum duff: a stiff flour pudding steamed or boiled usually and containing e.g. currants and raisins and citron

duff (noun)	plum duff (noun)
a stiff flour pudding steamed or boiled usually and containing e.g. currants and raisins and citron	a stiff flour pudding steamed or boiled usually and containing e.g. currants and raisins and citron