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.
headgear hedger hedgier hedgerow huger hegira hejira
headgear gear dogear dodgery sedgier regear podgier nudger lodger ledgier ledger codger judger cadger hedgier hedger edgier edger budger badger pudgier ridgier dodger dodgier wedgier