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.
annulled annulet annealed annulate aneled annelid analyte anolyte
nulled annulled knelled knolled nielloed nilled funnelled canalled kennelled panelled snelled tunnelled unallied unled channelled
annul annuli annal annual annually