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.
cliffs califs gliffs calfs clefs kalifs coalifies clevis clivias caliphs golfs gulfs qualifies calves claves clavus cloves kloofs cleaves cloughs glaives kaliphs
bailiffs cliffs gliffs fluffs selloffs falloffs pilaffs lowlifes kalifs califs bluffs boiloffs blaffs beliefs alifs luffs luffas reliefs sluffs
cliff cliffy calf calif caliph clef clivia gliff