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.
cherty chert charity cheroot chart shorty shirty chariot sheroot cheered chard short chord shirt sherd chared chored charade choired charred chirred chaired churred sheared sheered shortie choroid choreoid chorioid
cherty arty rarity purity pert parroty peart merit carroty hearty nerdy heart vertu wert treaty chert dorty shirty derat vert variety parity dirty surety purty pretty party perdy borty ferity beret ferrety forty fretty charity warty verity tarty shorty
cherry cheerio ochry ochrea ochery sherry churr chore chiru chirre chirr chiro cheery cheero cheer char chary charry charro charr chare chorea churro ocher ochre ochreae cheshire