Answer:

SNOWBALL

Answer	Crossword Clue
SNOWBALL	Get bigger
SNOWBALL	Winter ammo
SNOWBALL	Winter missile

SNOWBALL	Winter weapon
SNOWBALL	Cold war missile?
SNOWBALL	Accumulate rapidly.
SNOWBALL	Missile of a sort
SNOWBALL	Accumulate and accelerate
SNOWBALL	Gather momentum
SNOWBALL	Accumulate rapidly
SNOWBALL	Cold war ammunition?

SNOWBALL	Rapidly increase in size

Crossword

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