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.
mainstay meanest minacity monist hymnist moonset monazite mooniest mensed minced
mainstay nasty honesty canasta hyponasty density dynasty tensity
mains mans manas manes manos manse manus means miens minas mines minis minus moans amins