Holiest rhymes with:
costliest, cheesiest, costliest, creamiest, depriest, dupriest, greediest, healthiest, hobbyist, neediest, priciest, savviest, shakiest, stormiest
Holiest sounds like:
hallquist, halseth, halstead, halsted, helget, helseth, hillestad, hillside, holgate, holocaust, holst, holstad, holste, holstead, hulst