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.
skat skate skit scat scatt squat skeet skite sukkot socket scatty squatty sickout sect scot scad skid scut scoot scout scuta scute skeed skied squad