Answer:

watchtower

Answer	Crossword Clue
WATCHTOWER	Sentinel site
WATCHTOWER	Lookout's post
WATCHTOWER	Observation post

WATCHTOWER	Sentinel's post
WATCHTOWER	Sentinel's perch
WATCHTOWER	Sentry's lookout
WATCHTOWER	Lookout post

Crossword

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