What does "lighthouse" mean?

A tower or other structure exhibiting a light or lights to warn or guide sailors.

What is a synonym for "lighthouse"?

Common synonyms include: beacon, air-raid alarm, alarm, alarm bell, alarm clock, alarm signal.

/ˈlaɪthaʊs/ noun

noun ·Moderate ·College level

Noun

1
A tower or other structure exhibiting a light or lights to warn or guide sailors.
2
a tower with a light that gives warning of shoals to passing ships wordnet

"In the distance, there stood a dimly white lighthouse."

From light + house.