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.
spado spaed spade speedo spat spud sped spot spied spued spout spode siped sapid spate septa speed spait sputa sapped supped speedy sapota spotty sopped sapote souped seeped soaped sipped zapateo sept spit
spado pad padi paid keypad kneepad repaid spade spaed updo