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.
repeal repel reply rappel replay replow repoll ripely reapply ripply ropily roupily
appeal repeal peal pal cupel lapel opal pipal rappel paly pale pele repel pail pall spale speel spell tapalo tupelo chapel appel sepal pawl ripely plea nopal appal papal appall peel copal keypal spail pupal pial spall speil spiel tepal typal shapely
rep rope preppie prep crepy reap repay repo repp ripe rape rupee ropey arepa creep creepie creepy crepe crepey kreep prepay preppy