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.
freer farer frere frier firer fairer fearer fuhrer fuehrer farrier furrier firrier farriery furriery friar frore furor friary furore varier fierier
freer career poorer currier varier hearer wrier jeerer airer ruer frier nearer fuhrer barer farer hoarier carer hairier frere parer bearer firer merer fearer airier marrer mirier arrear rarer sheerer torero sharer cheerer tearier charier wirier drear wearier warier trier sorer roarer corer prier serer tarrier leerier direr querier sourer darer crier quarrier firrier eerier queerer rear burier merrier burrier farrier parrier fierier hurrier carrier fuehrer burrer hirer harrier orrery brier fairer borer barrier aerier furrier beerier gorier pourer marrier verier moorier sorrier curer dearer surer learier dourer lurer tearer soarer purer courier searer truer rearer wearer wirer drier worrier charrier terrier cheerier shearer tourer yarer
free fare fere fire fore frae froe fever reefer reefier refer referee revere reverie revery