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.
grovel gravel gravely gravelly carvel caravel caravelle careful gruffly corrival crevalle gruffily
grovel ravel reveal revel bravely caravel carvel gravel gravely marvel surveil drivel travel shrivel
grove garvey grave gravy groove groovy