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.
purlieu purl puerile parle prole parley parole purely pyrrole parolee pearl prowl peril prill parol parrel pearly poorly prelaw parlay parral pyrola pyrrol payroll perilla