I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
harrows harries hairs haars hoars hares heros hears hoarse hearse heroes haeres harass hearsay hurrahs hurries herries hurrays harissa hers heirs hours horsy hoers horse horas heres hires hirees horsey houris heresy horahs heiress heroize hoorahs hoorays
arrows barrows furrows sorrows farrows burrows yarrows marrows morrows narrows borrows harrows rows barrios churros cirrous trows ferrous drowse vrouws frows morros grows browse crows serows frowsy burros vrows prows brows drowsy cirrose charros karroos