The term 'large insect' can be summarized by two crossword solutions: Mantis (6 letters) and CICADA (6 letters). The Mantis is a large insect of the order Mantodea, which includes over 2, 400 species of praying mantises. They are typically characterized by their long, segmented bodies and raptorial forelegs. The CICADA is a large insect of the order Hemiptera, which includes over 3, 000 species. They are typically characterized by their loud, buzzing sound and their ability to survive underground for up to 17 years.