Knaves rhymes with:
aftershaves, behaves, braves, braves', cave's, caves, chaves, craves, dave's, daves, draves, graves, maves, misbehaves, paves, raves, save's, saves, shaves, slaves, staves, taves, waives, waves
Knaves sounds like:
kamp's, kamphaus, kamps, kemp's, kempke, kempski, kenefick, kennebeck, kimwipes, knapik, knapke, knapp's, knapsack, knbc, kneafsey, knives, knobs, konopka, kosanovich, kosnovsky, kosnovsky's, koznovsky, koznovsky's