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.
foil fil fool file filo fowl fill foul fail fila foal fille folio filly voila folia voile foley folly fillo flooie follow faille foully flu fly flaw veil vail vill vial fall flow feal fell flay flue flew fuel fley flea feel vole viol vile flee floe full villa felly ghoul fully flawy feyly viola phial fella villi
boil foil coil moil noil oil reoil roil soil toil