Plum duff and Plum-duff

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

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

Plum duff and plum-duff are semantically related. Sometimes you can replace phrase "Plum duff" with "Plum-duff", this phrases are similar.