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.
hack hackie hackee hick hawk heck huck haku haik hock hake haiku haika hoick hawkie hawkey hockey hickie hickey hic hag hike hoke hook howk huic hokey hokku hooka hooky
back hack jack quack lack mack knack pack rack wrack sack tack wack whack shack yack