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.
sanitise sanities sanitize snits saints santos sennits sienites sands snots scientize sonnetize suints snouts snoots scents sonatas sonnets sinuates sneds scends snoods sondes sounds synods
sanitise annuities vanities intis canities lenities monetise sanities sanitize tenuities unities unitize
sanity snit saint santo seniti