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.
frore furore furor frere furrier farrier firrier furriery farriery farer firer frier freer friar fairer fearer friary fuhrer fierier fuehrer
frore crore furore cruor urare corer sorer juror poorer horror mirror furor curare burrer error borer aurorae aurora roar rare marrer parure prior terror warrior
for fro faro farrow ferry firry fora foray fore forwhy froe frow furrow furrowy furry afore