Texas' 14-year-old Indian-American Karthik Nemmani won the 91st Scripps National Spelling Bee on Thursday by successfully spelling out the word 'koinonia'. Koinonia is a Greek-origin word that means a 'spiritual community' used to refer to Christian fellowships or communions. Nemmani competed in the championship as a wild-card contestant, beating fellow Texan Naysa Modi to win the title.