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.
septs spats spits spots spouts spaits sapotas sippets spitz spuds speeds spites spodes spades spates sapotes sopites speedos zaptiehs
septs bowpots tippets tappets spots spats puts repeats poppets pipets nepetas moppets lappets cowpats coopts coapts boughpots peats pats pots poets pits pietas pets opts pipits puppets repots sippets spits depots teapots whippets
sept septa seeped spat spate spit spite spot spotty sputa