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.
sabra saber sabir sabre subarea sober suber zebra sobber
sabra labra bra taber zebra sabre saber librae libra labor labara kabar caber abri brae bora sabir cobra bura subarea bray dobra braw tabor