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.
grail graal grill goral gooral grille gorily grayly gorilla guerilla gruel kraal growl craal crawl coral krill guerrilla greyly corral curial crawly growly cariole criollo carriole carl curl
rail drail brail grail frail derail serail trail irreal frill oral zoarial rill fierily areal viral prill roil sural leerily feral seral rural rial gooral oriel moral mural oorali hoarily airily tearily chorial chorale chiral charily wirily warily ureal trill trawl drily cereal serial drawl jural morale corral ariel gharial boreal riel burial graal rile kraal coral surreal grill gorily sorrily neural furrily goral loral real krill boral brawl brill narial peril aerily rale ferial loreal puerile parral aural eerily zoril crawl verily virile aerial merrily broil curial horal craal aril dural drill gyral trial triol urial wearily woorali cheerily choral choreal shrill