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.
curtesy courtesy curtsy curates curtsey curites curettes crates cartes curets courts courteous croutes creates quartes carates curds cowrites carts crits creds quarts carets crudes cruets quirts kurtas credos carats creeds grates caritas karates quartos garotes carrots gourdes crowdies corodies grottoes corrades corrodes garottes garrotes cords grots cruds garrottes corrodies karts cards grits quartz kraits grides grades crowds cairds gourds greets grouts griots guards korats krauts gratis groats karats greeds greats cardias garrets grottos
courtesy curtesy aretes writes rotes frites verites hearties artsy carates berates crates curites barites curtsey curates grates quartes norites parties prates yperites cerates certes sorites deaerates diorites hydrates urates garotes cowrites barytes garrotes rates brutes aerates ferrates ferrites fortes borates forties phorates virtues gyrates cartes curtsy rites karates narrates orates pirates pyrites rewrites cerites serrates sorties derates dirties tortes shorties
curt carte court crate curate cured curet curette curite curred