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.
gravel gravely gravelly grovel caravel caravelle carvel careful gruffly corrival crevalle gruffily
ravel caravel gravel travel reveal revel bravely carvel gravely grovel marvel surveil drivel shrivel
grave gravy crave garvey graph greave grove agrafe agraffe agrapha agraphia