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.
diary deary dairy dry dray dear dory dire dare deray derry dowry tarry deair teary hydria dearie tar try hydriae dor doughier troy dure tray drew tier tear taro tahr door dore dorr deer doer dour tare dere dura dree duro durr draw tire trey tiro tory
diary awry weary teary vary dairy parry marry leary knarry aery faery fairy fiar fiery chary wiry firry gharry quarry wary tarry deary saury nary liar miry airy kaury carry hoary harry hairy charry whirry tiara