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.
witneys witness witans whiteness wittiness wetness whitens whatness wideness weediness woodiness widens wheatens woodenness
jitneys witneys chutneys quietness retunes poutines patines meetness mutines tines tunes retenes tynes ratines atones duotones stanes wetness cetanes witness chutnees tawneys tones mootness soutanes ketenes hotness phytanes ketones fatness butanes stones tautness neatness routines whatness retines butenes attunes fitness kidneys patness