[{"Bold_text": "noun", "List Items": ["Military.a small, high-speed shell whose sound as it flies through the air arrives almost at the same instant as its explosion.", "a firecracker with a similar effect.", "Informal. whiz1(def5) whiz1(def5)."]}, {"Bold_text": "adjective", "List Items": ["Informal.first-rate; topnotch:a whiz-bang navigator."]}]