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.
cicadas cycads scads scats scuds skids scatts squads squids skidoos
cicadas cads cades cadis caids codas aggadahs aggadas facades haggadahs haggadas nicads cycads scads decades