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.
retorn return readorn retrain returnee retrainee redrawn
torn retorn attorn diatron cittern citrin matron readorn patron outturn outrun outran neutron gittern natron adorn turn tern tarn return pattern citron bittern stern biotron waitron
retore retear retire retiree retro retry reutter rotor fretter frettier pretor prettier reorder ureter