Coolest rhymes with:
cruelest, agriculturalist, analyst, ballast, beautifullest, calloused, capitalist, catalyst, cellist, conversationalist, cruelest, dullest, evangelist, formalist, fullest, gentlest, gollust, herbalist, humblest, institutionalist, journalist, littlest, monopolist, nationalist, naturalist, neutralist, novelist, palest, panelist, photojournalist, populist, psychoanalyst, simplest, smallest, socialist, specialist, stablest, televangelist, ultranationalist, violist
Coolest sounds like:
calcite, calcote, calcutt, calcutta, calista, callicoat, callicott, callicutt, calloused, calzada, celesta, celeste, cellist, chalked, chalsty, checklist, chilcoat, chilcote, chilcott, chilcutt, chillicothe, chilliest, clagett, claggett, clashed, classed, classicist, cliched, clicked, cliggott, cloaked, clocked, clogged, closed, closest, closet, closeted, coalesced, colgate, collect, collected, collegiate, colquitt, cyclist