Nicholson rhymes with:
mickelsen, mickelson, finkelson, michaelsen, michaelson, michelsen, michelson, mickelsen, mickelson, adelson, bartleson, berthelsen, danielsen, danielson, donalson, eagleson, finkelson, fogelson, haralson, harralson, huddleson, jesselson, kittleson, mendelsohn, mendelson, mendelssohn, meselsohn, meselson, michaelsen, michaelson, michelsen, michelson, mickelsen, mickelson, mitchelson, powelson, richelson, samuelson, tomilson, tumbleson
Nicholson sounds like:
nichelson, nickelson, nickolson, nicolaisen, nicolson