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.
datums diatoms daytimes diadems tatamis tediums teatimes totems didymous titmouse
stums datums totems diatoms stems items doums sodiums retems podiums odiums odeums mediums litmus bedumbs sedums atoms doumas atmas toms tams dumbs dumas radiums bottoms tediums shittims