Answer:

autogiro

Answer	Crossword Clue
AUTOGIRO	Kind of aircraft.
AUTOGIRO	Certain aircraft
AUTOGIRO	Helicopter's predecessor

AUTOGIRO	1920 aeronautical invention
AUTOGIRO	Cousin of a helicopter
AUTOGIRO	Early rotorcraft
AUTOGIRO	Aircraft with a rotor

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.