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