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.
libelous libellous libels libelees labels libellees lobelias labials lobules lobulose
libelous belows bilious blouse blousy bullous bibulous fabulous libellous nebulous nubilous obelus pueblos rebellious sabulous tubulous
libel libelee libellee label labella liable lobelia alible glibly