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.
tinnitus tints taints tineids dunnites tannates dints tents taunts tendus tenets teinds dunites teentsy tenutos dinettes tonettes tends tondos
manitus tinnitus nits kainits unites dunites kainites dunnites snits sennits pinites mannites manitos contuse manitous lenites gahnites gunites sienites nidus finites knits bonitos bonitas binits nites conatus mantuas reunites cantus units