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.
quartz quarts quartes quartos quirts carts karts guards carets carats courts curets cartes kurtas curtsy karats curtsey curtesy carates karates curites curates caritas garotes garrets carrots courtesy curettes garottes garrotes queridas
quartz ritz warts darts arts boarts bortz farts fritz harts hearts hertz carts karts quarts marts nertz parts tarts charts
quarried quart quarte quarto guard querida queried quired quirt squared squawroot