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.
treatise treaties treats trets tortoise treads traits turrets terrets tarts drats torts trots tortes derats trades tarots trouts triads tortas dreads tardies derates dirties teredos triodes territs toroids hydrates tortuous deaerates turds droids druids
treatise faradise gratis keratose mortise paradise tortoise treaties
treat treaty tret terete trait tread strata strati stretta strette stretti stretto