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.
repeat repot reaped repaid repped repute roupet rapt raped riped roped wrapt rapped ripped rouped wrapped
repeat peat pat pet puppet chapati pupate tippet poppet tapeta pipet spat leapt sippet nepeta lappet moppet roupet cowpat spait poet spate peaty tappet paty whippet pate chappati
rep rope preppie prep crepy reap repay repo repp ripe rape rupee ropey arepa creep creepie creepy crepe crepey kreep prepay preppy