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.
repours repursue repros repairs reapers repress reprise reappears rapers ropers reappraise rapiers rappers reprice rippers roperies wrappers
vapours pours repours sapours purs purse spores cuprous sopors sapors leprous purrs vapors guipures puris pores spoors pursy spurs