Whodunit rhymes with:
dunnett, brunett, dunnett, punit, banet, barnet, basnett, bennet, bennitt, bernett, bohnet, bonnett, brunett, burnet, burtnett, careunit, charbonnet, connett, cornett, dejarnett, dennett, disproportionate, dronet, dunnett, enitt, eternit, gannett, garnett, genet, gennett, goffinet, gonet, hardnett, harnett, hartnett, hodnett, hornet, illuminate, inabinet, indeterminate, inordinate, jennett, kinnett, kruttschnitt, kurnit, linnet, maisonet, minet, minit, monett, monnett, muavenet, nenet, plenet, punit, robnett, sasnett, sennett, signet, sinnett, sonnet, stennett, stinnett, vinet, wernet, winnett
Whodunit sounds like:
whatnot, whitemont, widened, woodwind