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.
heck huck hick hock hack hoick hackee hickie hackie hickey hockey hic haku hake hike howk hook hoke hawk haik huic haika haiku hokey hokku hooka hooky
beck feck heck geck keck neck peck reck wreck deck check