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.
creator curator creature crater greater cruder carter krater curter carder grater critter curdier greeter crowder crittur courter courtier cruddier criteria cowriter carrotier corder garter grader gridder gritter grodier grouter guarder quarter
creator juratory traitor hydrator sartor praetor oratory orator narrator moratory greater curator gyratory retore gyrator feretory aerator barretor barrator pretor deaerator toreador treater
create carat carate caret crate cruet curate curet curette great ocreate