Plum duff and Pudding

Plum duff noun - A stiff flour pudding steamed or boiled usually and containing e.g. currants and raisins and citron.

Pudding and plum duff are semantically related. In some cases you can use "Pudding" instead a noun phrase "Plum duff".

Pudding noun - Any of various soft sweet desserts thickened usually with flour and baked or boiled or steamed.

Plum duff and pudding are semantically related. Sometimes you can replace phrase "Plum duff" with "Pudding", this terms are similar.