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.
overdo overed overdue overt override overrode overrude offered overate overeat overrate
overdo havered severed ciphered reoffered hovered livered niffered veered laveered afeard beavered buffered fevered wavered differed shepherd suffered foredo fordo quivered cyphered revered overed offered levered louvered quavered goffered hoovered gauffered covered coffered wafered syphered chaffered sphered shivered