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.
sherd sheared sheered shred shard shored shroud shrewd shaird shared shirred cheered sheroot shrewdie shirt chord short chert chard chared chored shorty cherty shirty choroid shortie chaired chirred churred cheroot charred choired choreoid chorioid
herd sherd beard chard tiered cered perdy perdu peered nerdy nerd leered merde queered chert jeered heard hard veered sered weird cheered chord sheered jerid shard shred
sherry cherry share sharia shariah shear sheer shier shire shirr shoer shore shrew shri usher