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.
senseis senses sanseis censes synesis sensuous census seances sciences senecios sinuses sneezes snoozes
sanseis senseis lenses anuses quinsies kenosis kineses niseis noses joneses linseys bonuses mannoses enosis hypnoses pensees nonuses rinses menses ensues senses synesis zoonosis tennises tonuses pansies kinesis anises minuses guanases kinases genesis geneses genuses hanses ionises hypnosis venuses finises penises onuses rennases manses censes lionises gnoses gnosis sinuses zoonoses tansies tenses unsews
sense sensei cense sansei scenes seines senecio sensa