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.
prowl prole parol pyrrol pyrola parole purl pyrrole payroll parolee peril parle pearl prill parley parrel prelaw pearly purely parlay poorly parral perilla puerile purlieu
growl prowl triol drool drawl pyrrole pyrola payroll growly prole parole parol neroli nerol caroli narrowly role carol roil broil brawl barlow roll crawl pyrrol reroll droll trawl troll