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.
neotenies neotenous neatens neatness neediness newtons
neotenies botanies tetanies retenes ratanies mutinies liteness litanies lateness ketenes cuteness denies butenes betonies atonies tenuis tenues tennis tennies muteness tenias redenies dittanies whiteness tens