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.
creature creator crater greater crittur curator carder cruder krater curter grater carter corder greeter crowder courter critter curdier courtier cowriter criteria cruddier corduroy carrotier garter grader
creature serrature fioratura fioraturae fioriture nurture torture
create carat carate caret crate cruet curate curet curette great ocreate