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.
fletch fleche fleech flitch filch flesh fleshy flash flush flashy fluish foolish fellatio
fletch letch slatch klatch glitch clutchy latch leach lech leech litchi belch bleach blotch blotchy fleche fleech flitch caleche clutch cultch glitchy pleach welch
file flea flee flew fley floe flue foley