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.
libeled libelled labeled labelled labellate labelloid lowballed liability
libeled labeled bled baled dabbled rebelled pebbled nibbled libelled bield blued belied quibbled gobbled gabelled labelled doubled wabbled kibbled belled bleed nobbled mobled dibbled rubbled babbled rabbled bobbled bubbled gabbled tabled abled gabled cobbled cabled hobbled fabled wobbled
libel libelee libellee label labella liable lobelia alible glibly