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.
curter courter courtier carter crater curator quarter curdier critter quartier criteria cowriter carder krater corder garter grater cruder carrotier gritter grouter greater guarder creator crowder greeter grittier garotter grottier creature groutier garroter cruddier grader crittur gridder grodier corduroy corridor greedier
barter garter sorter hurter pearter quarter carter darter curter shorter porter courter perter tarter charter frotteur rooter cowriter fruiter narrater artier hoarder order mortar fretter harder fruitier rewriter rootier carrotier grittier frater rattier prater rioter purtier fritter rater dirtier chertier charioteer wartier ureter trotter treater bruiter retear reutter martyr courtier critter ferreter writer carder garroter partier murder ritter tartar artery barrater brattier boarder quartier heartier krater greeter grater ruttier birder girder gritter border rotter crater corder grottier greater sartor larder brighter irater grouter ratter garotter herder frettier guarder prettier parroter shirtier reorder groutier tartier triter troutier warder weirder router yarder
curt cured kurta curried curred curite curette curet curdy cart curd curate crit crate court carte scurried