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.
gliffs cliffs golfs gulfs califs kalifs glaives clefs calfs coalifies qualifies clevis gloves glyphs kloofs caliphs clivias kaliphs
bailiffs cliffs gliffs fluffs selloffs falloffs pilaffs lowlifes kalifs califs bluffs boiloffs blaffs beliefs alifs luffs luffas reliefs sluffs
gliff cliff cliffy glaive golf gulf gulfy uglify