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.
cologs clogs collogues colugos clags colics gloggs cloaks clocks colloquies colleagues cloques cloacas cowlicks calks glugs kilogauss caulks clacks clucks cleeks clicks gulags kolkoz calicos calques claques cliques glucose kolkozy calicoes glaucous killocks
blogs clogs slogs duologs cologs flogs logs dialogs sawlogs clags algas plugs glugs slags flags slugs belgas blocs logos flocs lugs bowlegs gulags valgus legs vulgus gloggs lags telcos
colog cloque cowlick cloacae cloak clock clog cloggy cloaca colic coeliac colicky colleague collogue colloquia colloquy colugo eclogue