Answer: lighthouse

AnswerCrossword Clue
LIGHTHOUSE

Flasher at the shore

LIGHTHOUSE

Sailor's navigational aid

LIGHTHOUSE

Signaler at sea

LIGHTHOUSE
Cape Hatteras structure.
LIGHTHOUSE
Navigation aid.
LIGHTHOUSEMariners' guide
LIGHTHOUSEPharos
LIGHTHOUSESeafarer's aid
LIGHTHOUSESeafarer's beacon