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.
twiny twin twain twine tweeny dwine tween twoonie
winy twiny win twin whinny twine twain swine rewin wain wany whin whiney whiny dwine winey wino gowany gwine lauwine lawine rawin swain wine