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.
repel repeal reply rappel replay replow repoll ripely reapply ripply ropily roupily
repel pepla chapel tupelo deeply spell speel sepal ripely reply repeal rappel peepul peal lapel cupel appel appeal pele peel speil spiel tepal wheeple shapely
rep rope preppie prep crepy reap repay repo repp ripe rape rupee ropey arepa creep creepie creepy crepe crepey kreep prepay preppy