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.
quartos quarts quartes quirts quartz karts carts courteous courts cartes curets carets karats curtsy guards carats kurtas curtsey karates carates caritas garotes curites carrots grottos curtesy curates garrets curettes garrotes queridas courtesy garottes keratose grottoes grots cards garrottes crits curds grits greets korats crates cruets credos gratis krauts groats cairds grouts gourds crowds grates griots greats kraits cardias creates croutes gourdes
quartos arts warts tarots sarods marts hearts airts artsy boarts burritos ratos farts rotos harts carets cartes carts karats karts quartes carats keratose quarts parts darts tarts charts
quart quarte quarto quarried quirt squared