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.
scarier scarrier scarer sugarier scorer scourer securer squarer sugarer sacraria
scarier sugarier gorier sugarer squarer scarrier scarer puckerier querier quarrier career curriery currier crier courier carrier carer decrier
scar scare scarey scarry scary scaur scoria scoriae escar