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.
scarred scared scurried sacred scored screed scried skirred sugared scoured squared secured saggared scrod saggered suckered scart secret cigaret saggard secrete skirret squired cigarette scrota
garred scarred shikarred scurried recarried sugared skirred acred scared saggared sacred recurred nacred caried squared cared quarried garret curried curred carried beggared
scarry scar scare scarey scary scaur scurry escar