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.
trull troll truly trill torula trolly trolley torulae tirl terrella triol drill droll trawl trail trial drolly tearily trawley hydrilla dirl
trull rill truly troll torula drill prill neurula rule ruly brill ferrule ferula ferule frill carrell cruel curule grill gruel krill morula payroll reroll droll trill roll shrill