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.
cycads cicadas scads scats scuds scatts squads
cads cycads nicads scads aggadas decades quads scuds qaids qadis cicadas cockades goads mikados haggadas eggheads cades kadis gadis cuds cods cats caids gads gauds egads scats cadis squads facades ducats