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.
quell quill quoll quelea quillai gull cull quillaia kelly quail quale gully cully gulley cullay qualia gul glue keel kill koel call caul clue gall
quell ell fella felly foully fuel full fully fell hell hull jell jelly bully quoll nelly mulla niello paella cell celli sell sully delly duelli dull tell tulle welly shelly mell cully bell knell boulle belly belle hello hullo jello bull cull gull kelly bulla gully quill mull lull nielli null pull cella cello selle dell duel duello dully telly well shell yell