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.
require recur regrew reekier raker rigor rocker rigour regrow rigger reeker racker rugger recarry rockery rockier roguery rookery rookier wreaker wrecker
quire require squire quare faquir square daiquiri