a person who flies an airplane or helicopter
Pilot
to fill a space completely so that it becomes slow or stopped
Jammed
to call out loudly
Hollered
careful about avoiding danger or risks
Cautious
the driver of a dogsled
Musher
very brave
Courageous
able to think clearly
Alert
a confusing system of connected passages
Maze
to blow or rush in gusts
Gusted
a severe snowstorm that goes on for a long time
Blizzard
a type of snowstorm in which the falling snow makes it very difficult to see
Whiteout
a set of straps that are placed on a animal so they can pull something heavy
Harness
someone who does something without being forced
Volunteer
to make a serious promise
Vowed