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.
retype retape redip
biotype cotype neotype retype type typey watape typo stope biotope retape potpie tope typy metope tape stipe typp stupe etape wattape
ret reata rete retie arete arty fret fretty pretty tret