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.
locution location lection liquation legation ligation
caution recaution locution diction section rogation cation vocation reaction negation liquation ligation legation lection coaction fiction equation auction action kation coition vacation location ruction paction suction faction taction