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.
crasis crases crisis creases crises crazes cuirasses curses corses cruses carses curassows carassows coryzas creeses grasses crosses courses cruises greases crazies cresses carouses curacies caresses graces cruces coriaceous grazes crozes gorses krises carices coerces grosses grouses kerseys gracioso gracious graecize grazioso griseous karosses
crasis phoresies hydrases dieresis xerosis pyrosis prissies merisis crisis paresis creases crases gyrases heresies virosis whereases urases phrases pheresis prases ureases terrases diuresis diaeresis sorosis prossies neurosis rases greases arrases arsis boreases brassies erases charases
crass crease grass curs curacy crus cross crissa cris cressy cress creasy crazy carassow craze craws corse cors carse cars crosse cruse curassow curse grassy