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.
humanise humanize humans humanness hominize hominies hemins haemins homines hambones hominess hamminess homeyness
romanise humanise womanise manias manse meanies feminise humanize immunise communise hypomanias reminisce romanize zoomanias demonise womanize