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.
scarer scarier scarrier scorer scourer securer squarer sugarer sugarier sacraria
carer scarer sugarer squarer career decreer courier corer securer scorer scarier puckerier curare requirer puckerer carrier crier curer gorier quarrier queerer querier augurer bickerer figurer scourer scarrier sugarier currier decrier
scar scarry scary scare scarey scoriae escar sacra scaur score screwy scree scoria scry scurry sucre screw escrow