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.
diatom datum diadem totem tatami tedium daytime teatime
diatom atom tom tomb tome toom atma atomy bottom satem stoma zootomy datum
dit dawtie doated dieted dauted edit duit doat ditty ditto dite dita diet deity dawt data dautie daut datto dato date doit adit dated dawted dittoed doited