Tallest rhymes with:
gaullist, anti-federalist, bicyclist, brittlest, colonialist, criminalist, cyclist, dualist, duelist, editorialist, environmentalist, experimentalist, fatalist, federalist, finalist, fundamentalist, gaullist, generalist, gradualist, idealist, imperialist, individualist, industrialist, instrumentalist, internationalist, loyalist, materialist, medalist, mercantilist, minimalist, moralist, motorcyclist, noblest, philatelist, presidentialist, pugilist, realist, revivalist, royalist, semifinalist, sensationalist, spiritualist, stylist, survivalist, traditionalist, vocalist, zimbalist
Tallest sounds like:
tailgate, talcott, talked, telecast, telequest, telesat, telewest, telexed, tolstoy, twilight