Benchmark's rhymes with:
benchmarks, benchmarks, benchmarks, benchmarks, deutschemark's, deutschemarks, benchmarks, birthmarks, bismarck's, caremark's, cellmark's, denmark's, deutschemark's, deutschemarks, earmarks, hallmark's, hallmarks, hartmarx, landmark's, landmarks, pathmark's, raymark's, southmark's, trademarks, watermarks, westmark's
Benchmark's sounds like:
bankamerica, bankamerica's, benchmark, benchmarks