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.
sporoid sparoid spiroid sparid spored spoored sprit sport superroad sprout spired sporty spread spared spirit sprite speered supered spurred spiered speired speared sparred seaport support superadd spirt sprat spurt
sporoid leporid sparoid spiroid