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.
mucor mucro mucker muckier macro micra micro maugre mocker muggar mugger muggur mockery muggier
mucor cor coir core cory liquor lucre mucro score scour soucar sucre decor chicory