15 possible answers to
Answers with 4 characters: LIEU SWAP TEMP Answers with 5 characters: PROXY SCRUB SITIN Answers with 6 characters: ACTFOR ERSATZ FILLIN Answers with 7 characters: STANDIN Answers with 8 characters: ALTEREGO ROTATEIN Answers with 9 characters: ALTERNATE Answers with 10 characters: QUIDPROQUO Answers with 11 characters: BENCHWARMER