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.
courter courtier curter cowriter carter corder crater curdier quarter critter curator grouter quartier criteria groutier carrotier grater garter cruder carder krater greeter greater crowder gritter guarder garotter corduroy cruddier grittier grottier corridor garroter creature grader creator crittur gridder grodier
hurter courter curter rater bruiter heartier garter partier narrater quartier krater grouter cowriter frater fruiter irater perter prater rewriter darter tarter triter ureter charter shirtier ferreter barrater carter murder tartier troutier sorter dirtier porter purtier crater groutier pearter parroter chertier wartier courtier reutter quarter writer router grater artery garroter barter artier shorter
court curt croute curate curet curette curite scoured