Today's examples are blancmange and blancmanger, both nouns. Here are the OED's revelations about those words, intriguing at least to me:
†a. Formerly: A dish composed usually of fowl, but also of other meat, minced with cream, rice, almonds, sugar, eggs, etc. Obsolete.
b. Now: A sweetmeat made of dissolved isinglass or gelatine boiled with milk, etc., and forming an opaque white jelly; also a preparation of cornflour and milk, with flavouring substances. (Isinglass is another word that may not be familiar to readers. I draw here from Wikipedia:
(Parenthetically, "isinglass (/ˈaɪzɪŋɡlæs, -ɡlɑːs/) is a substance obtained from the dried swim bladders of fish. It is a form of collagen used mainly for the clarification or fining of some beer and wine. It can also be cooked into a paste for specialised gluing purposes. The English word origin is from the obsolete Dutch huizenblaas – huizen is a kind of sturgeon, and blaas is a bladder, or German Hausenblase, meaning essentially the same.") What a splendid inquiry within an inquiry.