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.
scoter scouter scooter scatter scowder scutter scattier secateur sector skater skitter sectary skeeter skittery squatter ciguatera squattier skidder sequitur skiddier
cooter scoter scooter quoter fagoter guttery quitter racketeer picketer boycotter locater requiter rocketeer guttier coater goiter couter goutier cuter gater gaiter scattier cutter scutter skater skitter squatter decoder coder cattery faggotry quieter cater cattier pocketer negater vocoder acuter cotter cautery cottier kiter bigotry ciguatera gutter racketier ricketier rocketer scatter scouter secateur skeeter skittery squattier dictier
scot scottie scat scatt scatty scoot scout scut scuta scute sect ascot escot