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.
senecios senseis senses seances synesis sciences sensuous sanseis sneezes sinicize censes census
senecios conscious minacious monecious monoecies monoecious nuncios tenacious
senecio scenes seance seines sense sensei