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.
terrets territs turrets trets treats teredos torts trots treaties treatise tarts tarots traits trouts derats treads tortas derides tortuous darts dirts turds drats tortes trades triads dreads droits derates dirties tardies tirades toroids triodes
barrets turrets terrets ferrets garrets rets aretes berets greats treats frets carets pierrots parrots carrots greets keiretsu curets territs cruets trets burets worrits
terret tarred teared teredo terete territ tiered turret stereoed