Answer:

decagon

Answer	Crossword Clue
DECAGON	Twice-as-good Defense Department?
DECAGON	Plane figure
DECAGON	Shape with ten sides

DECAGON	10-sided figure
DECAGON	Ten-sided figure
DECAGON	It has 10 angles
DECAGON	Shape whose regular version has 144-degree internal angles
DECAGON	10-sided shape
DECAGON	Figure with 10 sides
DECAGON	2-D figure
DECAGON	Ten-angled, ten-sided figure.

DECAGON	It has 10 sides.
DECAGON	If it's regular, each of its angles is 144 degrees
DECAGON	Belizean dollar coin's silhouette