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.
retry redry retro retear rudery retire retore rotary reutter retiree ruder rotor rater rider rooter raider router ridder redear reader rotter rioter redraw redder ritter redrew ratter rudder writer rattier readier reedier rootier rowdier ruddier ruttier
retry poetry try tray foetor retro metro notary deray deary tory terry teary derry mattery meter littery troy powdery rotary story stroy deter dieter teeter tetri watery sheeter guttery cautery jittery battery tottery dietary doddery stray datary cattery rudery metre trey buttery peter tetra betray chattery bootery meeter fetor votary nitery gaudery quieter lottery pottery redry eatery shuddery
ret reata rete retie arete fret fretty pretty reared reread reroute rewrite rewrote tret