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.
purl purely purlieu puerile pearl prowl prill prole parol parle peril poorly pyrrol parrel parley pyrola prelaw pearly parral parole parlay parolee payroll perilla pyrrole
burl furl hurl curl knurl nurl purl churl