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.
census censes sensuous senses senseis sanseis seances sinuses synesis sciences senecios zoonosis
census nisus ensues hansas hanses cansos kanzus lenses manses mensas menses nonissues rinses censes senses tenses
cense scenas scenes sensa sense sensei cessions