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.
growl growly graal crawl gruel grill grail carol goral gorily crawly caroli greyly creole gooral grayly grille cariole corolla criollo gorilla carriole guerilla carl curl guerrilla
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