The term 'TAPE DECK BUTTON' refers to the buttons found on a tape deck, which is a device used to play and record audio tapes. The four crossword solutions for this term are REWIND (6 letters), REC (3 letters), ERASE (5 letters), and EJECT (5 letters). The REWIND button allows the user to rewind the tape to an earlier point in the recording. The REC button is used to start recording on the tape. The ERASE button erases the contents of the tape. Finally, the EJECT button ejects the tape from the deck.