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.
feebly feeble fable fibula foible viably fabliau
feebly hubbly chubbily wobbly doubly sowbelly rebel belly ably bubbly feeble viably belay knobbly jebel nebuly nobbily nobly nubbly pebbly pueblo rubbly suably wabbly chaebol shabbily