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.
hydrate derate drat hydride derat deaerate hydrid hydroid diorite dirt dart trade dared trait dured droit dreed dread dried treat torte trite deride dorado tirade treaty deaired
hydrate rate drat karate aurate carate crate create curate narrate lyrate pirate cerate seriate deaerate serrate derat variate derate orate gyrate phorate irate cirrate prate muriate ferrate laureate grate aureate berate borate aerate urate rat
hydra hydrae hydria hydriae hydro