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.
cluck click clack clock cowlick calk colicky cloak klick caulk colic cleek clique cloaca colugo cloque calque claque cliquy calico killock killick kolacky coeliac cloacae cliquey colloquy collogue clag clog glug klik colleague colloquia
luck pluck cluck slick taluk flock flack saluki rollick flick pollock plucky shlock fleck plack killock klick killick block fluky fluke toluic bullock cowlick lock lick black rowlock relock pollack hillock click lucky lack clock alack mullock clack slack talcky taluka shellack shylock