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.
scad scud scat scatt cycad squad scudi scuta scudo sagged cicada sicked soaked scatty sucked sacked socked cicadae sect scot skat skid scut scoot scout scute skate skeed skied squat squid