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.
ariel aril areal airily areola areole areally areolae aryl aureola aureole aureolae aural aurally
riel ariel oriel ferlie irreal loreal carrell rail aerial eerily brail sorrel serail purely rile frill narial fierily sorel aril jurel reel broil rial krill prill trill shrill surely choreal charlie gorily wirily warily derail ureal real parrel drily trail grill drail cereal zoarial laurel merrily cruel virile rely gharial girlie sorrily peril ferial drill puerile zoril urial ferrel trial barrel creel rarely grail airily serial saurel curial boreal aerily rill hoarily chorial gruel charily roil frail morel merely leerily quarrel areal burial brill barely cheerily carrel furrily verily sorely surreal direly tearily triol wearily yarely