Which word names both a gazebo and an outdoor newsstand?

A gamma-ray burst that was briefly visible to the naked eye in 2008 took place at a distance of 7.5 billion what? A gandy dancer works on what all the livelong day? What is a gap through a mountain range, like Donner, called? What would the Argentine gaucho be called in Texas? Which 1841 ballet has been called "the Hamlet of dance"? A Geiger counter is used primarily to measure what? A gendarme has which job in France? A genetically engineered version of which produce item went on sale in 1994 under the name Flavr Savr?