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.
gentoo gent genet genette giant junto jennet
gentoo manito tenuto snoot santo cento punto pinto panto onto lento bento conto canto junto into finito bonito snood tanto unto
gen gene genie genii genoa genu genua gien agene