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.
secateur scatter scattier scoter sector skater skeeter sectary scutter scouter scooter sequitur squatter ciguatera squattier skitter skittery
secateur cater coater gaiter gater ligature locater negater ciguatera scatter skater squatter