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.
carter curter garter carder crater carrotier quarter critter courter garroter cowriter quartier criteria courtier garotter cruder krater corder grater greeter guarder crowder gritter greater crittur curdier grouter creature groutier cruddier grottier grittier grader creator curator 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
carte cart scarred ecarte acarid curt crate carroty carrot carried caried caret cardio cared cardiae cardia card carate carat caird crit kart acaroid scared scart