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.
flitch fletch filch fleche fleech fluish foolish flash flesh flush flashy fleshy fellatio ghoulish
flitch glitch slatch klatch blotchy cultch clutchy clutch cliche caliche fletch filch laich blotch litchi lichi lich letch latch glitchy milch zilch