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.
guards gourds gourdes curds grads cards grids quarts grades cairds grides greeds garotes quartos garrets cardias quartes garottes garrotes cruds cords carts karts grits creds grots garrottes carets crowds grouts credos curtsy gratis griots greats carats gradus crudes courts greets groats cartes grates quirts quartz kurtas karats curets creeds caritas curtesy curites carates carrots grottos curtsey curates karates corodies corrades corrodes courtesy crowdies curettes grottoes queridas
bards chards liards hoards nards pards fards shards beards cards guards hards boards wards lards yards sards braids reads jerrids rads myriads byroads karts irids broads birds marts marauds parades hybrids bardes cruds creds arts perdus frauds gourdes harts grids turds farts shreds fords chords gradus surds words weirdos raids treads fiords tirades dorados hydrids sciurids hurds jerids irades hearts purdas grades nerds brads hairdos girds rods burds nurds grads readds parts gourds cords breads rids sarods curds herds lairds merdes lords carts ordos reds boarts murids corrades oreads darts parados quarts farads roads rereads hordes prods charades sords cairds tarts dreads trades triads urds warts weirds charts shairds sherds yairds yirds
guard garda gardai garote garotte garred garret garrote garrotte gourd gourde quarried quart quarte quarto