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.
humanize humanise hominize humans humanness hominies homines hambones hominess hamminess homeyness hemins
romanize humanize womanize meanies feminize hominize humanise immunize communize romanise simonize deaminize demonize womanise