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.
scend send scent seined sand sned cent sent senti sente sound cento sandy synod sonde centu saned snood sundew senate seniti cenote centai sennet sennit signed sinned sained sundae sunned saunaed sienite zenaida snit snot
scend end sheened weened tend duende scent rend lend cent pend peened mend menad kendo maenad bendy keened bend vend hyphened fiend fend queened send teind tendu wend shend
scena scene sen seen seine sene senna sewn sienna