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