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.
segue seg seek sego skee sickee suk sag sec suq sequoia soke saga skew sike sake sago suck skua souk syke
segue ague fugue vague vogue gigue league maguey rogue tegua togue chegoe cheque