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.
karats karates karts korats krauts carats kraits carates carts keratose carets groats crates cartes quarts greats gratis grates garotes quartes creates carrots garrets quartos curates cardias caritas garrotes keiretsu garottes grits cards grads grots crits garrottes curtsy greets grouts quartz kurtas cruets guards courts curets griots quirts gradus cairds grades curtsey curites croutes grottos curtesy corrades courtesy cowrites curettes grottoes
rats frats carats prats derats karats brats jurats korats drats rets curates farads garrets brads borts gyrates boarts merits hurts barrets crits fortes quartes forts virtus farts grads ports ratos curtsy gratis ferrets orates writs krauts parrots crates carrots arts seriates shorts cherts worts whorts urates trots treats torts tortas terrets tarots reatas courts deaerates sorts hearts marts cerates berets grits pierrots verts erratas lariats morts rates girts narrates aortas ferrates frits harts cartes nerts greats phorates laureates carets pirates ruts brits groats carates karates carts quirts dirts variates vertus karts burets derates kurtas airts frets creates artsy borates bruts quarts parts rots certes muriates kraits rads riatas grots fortis quartos orts grates berates prates curets aerates serrates purdas darts hydrates tarts territs tortes traits trets turrets warts worrits charts shirts yurts
karat karate carat carate kart korat krait kraut