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.
truer trier torero tourer tearer tarrier tearier darer direr drier drear dearer dourer dreary terror terrier terraria
ruer truer farer carrier curer cruor gorier barrier hurrier hearer career leerier direr hairier searer hoarier firer merrier moorier wrier fuhrer airier varier orrery frier fearer freer parrier tearier shearer cheerier darer charier wirier marrer wearier warier tarrier trier drear airer pourer rearer sorer parure eerier querier rear torero sourer purer arrear courier learier roarer beerier crier carer frere nearer burier drier tourer furrier poorer burrier parura farrier firrier brier dearer corer currier harrier marrier fuehrer fierier borer crura mirier verier parer burrer sorrier tearer terrier prier bearer hirer rarer lurer quarrier surer dourer barer fairer wearer wirer aerier worrier charrier soarer sharer yarer
true tare tire tore tree trey tyre ruder rudery strew