The term 'operatic goddess' can be broken down into two crossword solutions: DIVA (4 letters) and Erda (4 letters). A DIVA is a female opera singer of great renown, while Erda is a character from Richard Wagner's opera cycle Der Ring des Nibelungen. Erda is a powerful earth goddess who appears in the third opera of the cycle, Siegfried. Both Divas and Erda are symbols of female power and strength in the operatic world.