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.
skater skitter skeeter scatter scattier squatter secateur skittery squattier scoter scooter skidder scouter scutter skiddier ciguatera sector scowder sectary sequitur
cater gater skater locater coater negater equator locator fagoter gutter legator kiter quieter quoter gator cottier pocketer skitter quitter racketier ricketier rocketer scatter scooter scouter secateur skeeter skittery squattier goutier squatter goiter racketeer picketer cooter cautery cattier cattery negator cuter boycotter cuatro couter guttery gaiter guttier requiter rocketeer ciguatera scattier scoter scutter acuter cotter quatre cutter dictier
skat skate scat scatt scatty skit skite