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.
ofter
after softer lifter defter tufter sifter lofter lefter shifter hafter ofter hefter rafter poofter wafter dafter heftier phatter righter defeater fatter niftier maftir fighter feater footer beefeater coveter mightier devouter weightier fitter weighter vetter sighter refuter tuftier footier buffeter loftier voter naughtier laughter fetter fattier riveter lighter tighter wiftier vetoer shiftier