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.
merer merrier marrer mirier mirror marrier moorier
jeerer merer sheerer cheerer queerer serer arrear purer darer fuehrer fearer soarer marrer hearer derriere tearer carer sourer rearer searer fuhrer orrery firer frere curer wirer sharer tourer dourer shearer lurer corer poorer direr parer surer hirer nearer fairer bearer barer airer wearer torero dearer rear borer pourer rarer roarer burrer farer drear sorer yarer
mere mare merry mire more mure ameer emeer emery omer