Answer:

mainmast

Answer	Crossword Clue
MAINMAST	Maritime upright
MAINMAST	Schooner spar.
MAINMAST	It's in front of a mizzen

MAINMAST	Mizzen neighbor
MAINMAST	Schooner or brig component
MAINMAST	Yawl pole
MAINMAST	Post at sea

Crossword

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