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.
sparid sparoid spared spiroid sporoid speared sparred sprit spored spired spirit sprite spread spoored supered spurred speered speired spiered separate superadd spirt sport sprat spurt superroad sporty sprout seaport support zippered
sparid jeopard spiroid sparoid spared reappeared leporid leopard coappeared jeopardy pard pardi pried pride period parried pared pardy appeared speared sporoid
spar spare sparrow sparry sprue supra spree spurrey spur spry spirea spray spiry spire spiraea spear spurry spore osprey