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.
courtesy curtesy curtsy courts courteous curtsey curates croutes curites curettes cowrites curets cartes crates carates quartes creates gourdes corrodes corodies corrades crits curds carts creds cords corrodies carets cruets kurtas grouts creeds carats crudes quarts quirts grates gourds korats carrots garotes karates caritas quartos crowdies corridas garrotes grottoes garottes garrottes cards karts grots grits cruds karats kraits credos guards crowds groats griots greats grides greeds gratis grades cairds krauts quartz greets
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
court curt croute curate curet curette curite scoured