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.
sapient spent spinet spinto spinout saponite spend spendy spined spinate supinate spanned spawned speaned spondee spooned
sapient pent pint reappoint depaint viewpoint spinet spent repent repaint appoint bepaint point pinto pinta pinot paint spinto waypoint