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.
deaerate derate derat dart drat hydrate terete diorite deaired dirt tart tarty trait dread tarot dorty dreed torte dirty treat droit trite deride dorado teared teredo terret territ tiered treaty
aerate berate derate cerate deaerate rate laureate borate aureate aurate create variate muriate crate seriate grate verite derat hydrate urate serrate pirate orate cirrate ferrate curate karate lyrate narrate yperite cerite irate carate prate gyrate hereat phorate terete whereat rat
dear deer deair dearie deary eater eatery dater deader deter