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.
cracks caracks carracks creaks crakes crucks cricks crocks croaks carks corks crocs crags curacaos curacoas creeks crocus crooks carcase carcass cariocas karaokes groks kirks cargos quarks quirks cargoes croquis
racks reracks carracks tracks wracks barracks hayracks caracks cracks arracks wricks rakis wreaks crucks bricks touracos ricks croaks crocks quarks arcs darks narks seracs larks crakes narcs ruckus marcs derricks berakes creaks recks cricks maracas turacos pricks charks rocks parks barks rakus freaks drecks triacs wrecks hayricks marks brocks phreaks breaks rakes carks frocks tricksy trocks harks arks rucks araks brakes sarks drakes traiks tricks troaks trucks warks fracas sharks
crack cracky scrag curacao cruck crock croc croaky croak crickey crick creaky creak crake craggy crag carack curacoa scraggy