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.
treaties treatise treats trets traits tortes trades treads terrets derates turrets triodes dirties tardies hydrates tarts torts trots drats deaerates tarots triads trouts tortas dreads derats territs tirades derides teredos toroids druidess hydrides tortuous turds droids druids
treaties ferities reties roadies carates borates aerates berates prates cerates purities serrates parties orates sureties muriates derates quartes hydrates gratis treatise crates charities curates rates forties parities hearties verities gyrates variates phorates varieties pirates rarities pretties seriates narrates ferrates sorties laureates deaerates karates dirties grates readies cartes urates creates shorties
treat treaty tret terete trait tread strata strati stretta strette stretti stretto