Bank note and Twenty dollar bill

Bank note noun - A piece of paper money (especially one issued by a central bank).

Twenty dollar bill and bank note are semantically related. In some cases you can replace phrase "Twenty dollar bill" with "Bank note", this phrases are similar.

Twenty dollar bill noun - A United States bill worth 20 dollars.

Bank note and twenty dollar bill are semantically related. You can use "Bank note" instead a noun phrase "Twenty dollar bill".