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.
crocus crocs crocks croquis cariocas cricks crooks crucks croaks cargos cracks caracks carcass cargoes carcase crux carracks carks corks crags grogs groks crakes creaks creeks gregos curacaos curacoas garigues karaokes
crocus brocks trocks terraqueous durocs sarcous circus percuss eurokous rocks rocs ruckus rugous arcus recuse frocks raucous verrucous heroics irriguous cariocas crocks crocs orcs cercus circusy drouks tarocs torcs turacous
croc crock crack cracky crick crickey croak croaky crook cruck scroggy