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.
curator creator curter crater courter courtier krater carter grater crowder quarter critter greater curdier cowriter quartier corduroy carrotier carder cruder garter grader corder crittur greeter gritter grodier guarder
aerator curator narrator hydrator barrator gyrator deaerator orator frater rotor heritor parador krater prater irater sartor mirador barratry narrater gyratory barrater barretor rater grater oratory praetor crater moratory phratry juratory pretor creator traitor
curate curt carat carate court crate create curet curette curite