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.
cracked croaked crocked creaked cricked carked corked crocket crooked cragged cricket coracoid cricoid grokked quirked crocoite corrugate coerect correct crewcut croquet
racked wracked cracked barracked reracked tracked narked barked creaked wreaked racket recked croaked braked cricked pricked freaked darked rocked carked larked raked charked crocked rucked harked marked troaked wricked frocked arcked phreaked bricked traiked parked trucked bracket ricked wrecked beraked tricked trocked warked sharked
crack cracky carack crake creak creaky crick crickey croak croaky crock cruck curacao curacoa