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.
greats greets gratis groats grates garrets creates grots grits grads curets cruets griots carets korats karats crates grouts grides gradus kraits greeds grades krauts carats garotes curates karates carates gourdes grottos grottoes garrotes keratose curettes garottes keiretsu karts grids creds crits carts garrottes cartes kurtas curtsy credos guards gourds crudes creeds quirts courts quarts quartos curtsey croutes curites cardias caritas quartes carrots curtesy corodies corrades corridas corrodes courtesy cowrites crowdies queridas
greats treats aretes gyrates barrets phorates berates arts berets frets farts crates seriates ferrets carets hydrates brats keiretsu nerts variates curets boarts carates muriates drats charts rereads urates trets karats laureates treads terrets darts oreads parts quarts cruets breads prates derates groats proteas borates kraits grates aerates gratis korats rets karts erratas frats rates greets verts traits jurats orates rats reatas riatas carts narrates serrates ratos garrets ferrates derats hearts reads prats creates pirates carats parietes protease dreads tarts curates marts krauts burets lariats cerates deaerates harts turrets karates warts cherts
great create gored grad grade grat grate greed greedy greet groat agreed egret recarried regard