Lightship (noun)

A floating lighthouse equipped with lights and other navigational aids, used to mark a dangerous coast or a shipping lane.

Origin:

From the words light and ship.

Examples:

1. The lightship helped guide ships safely through the dangerous waters of the harbor.
2. The crew of the lightship lived on board for weeks at a time, tending to the lighthouse and monitoring the surrounding waters.
3. The historic lightship is now a museum, showcasing the equipment and living conditions of its past crew members.
4. Lightships were once an important aspect of coastal navigation, before being replaced by more advanced technology.
5. In stormy weather, the lightship would rock back and forth, making it difficult for the crew to keep the lights shining steadily.