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.
sanitize sanities sanitise sonnetize scientize sienites snits saints santos senates sennits sinuates sands sneds snots scents snoots snouts sondes suints
unitize sanitize annuities vanities canities quantize lenities monetize hypnotize sanities sanitise scientize sonnetize tenuities unities
sanity snit saint santo seniti