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.
secund second seconde secondi secondo sequined secant sequinned skeined scandia sequent sickened scant scanty squint scanned siganid skinned squinty
fecund jocund secund cunt acned second