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.
potence potency patience patency poteens hypotenuse pittance potteens patens pudency pattens poutines pottiness hypotonias patins pitons putons patinas patines patness
potence tenace tense audience butenes cadence ketenes quittance laitance latency patency patience pittance potency retenes stance