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.
frusta frost first forestay forest frowst freest frosty frowsty fairest firriest frisette furriest foresaid fieriest verst verist verset verste farside varsity veriest feracity ferocity fireside foreside frizette virusoid
frusta roust turista trust tourista periostea rust rusty arista aristae barista burst forestay hurst crista cristae cruset crust crusty curst durst truest trusty wurst
firs frass frise frisee frouzy furs