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.
artsy arts airts aortas aretes ariettas ariettes aroids arduous
artsy curtsy borts parrots curtsey brats carrots quirts forts virtus hearts fortes carts brits merits bruts berets prats courts boarts barrets girts pierrots frats trets shorts frets cherts worts tarts whorts turrets derats tortes garrets kurtas territs nerts drats karts quartos curets sorts grots verts carats farts harts ruts airts vertus ports carets writs marts rots rets parts courtesy crits hurts quarts rats burets cartes orts ferrets fortis jurats curtesy korats grits certes frits quartes karats dirts morts terrets arts torts tortas darts trots warts tarots worrits charts aortas shirts yurts
art airt aorta aortae arete arty