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.
spiered spired speired supered speared speered spored spared spread spoored spurred spiroid sparred zippered superadd spirt superette superroad sprite spirit sparid sparoid sporoid sprat sprit spurt sport sporty sprout seaport support
rapiered spiered chippered diapered supered kippered peered appeared capered coappeared coopered coppered paired repaired loppered lappered papered paupered peppered reappeared speared speired lippered speered spired zippered tapered choppered
spier spear speer speir spiraea spire spirea spiry super asper aspire