Witness' rhymes with:
eyewitness, witness, eyewitness, fitness, witness, abruptness, absoluteness, acuteness, alertness, appropriateness, astuteness, bluntness, brightness, compactness, completeness, correctness, cuteness, directness, earnestness, eyewitness, faintness, fastness, fitness, flatness, forthrightness, gauntness, greatness, hartness, inertness, jointness, lateness, lightfastness, lightness, neatness, politeness, quietness, remoteness, rightness, robustness, separateness, shortness, softness, steadfastness, stoutness, sweetness, swiftness, tartness, tightness, unpleasantness, vastness, wetness, whiteness, witness
Witness' sounds like:
wadhams, wading, waiting, wedding, weddings, weeding, wetness, wetting, whitenack, whiteness, whitening, whiting, whitings, whitman's, whitney's, whitting, widening, widens, widing, wieting, witness, witness's, witnesses, witnesses', witting, woodhams, wooding, woodmac, woodmansee