Input: Identify the most salient words:

A white train at a docking station that is surrounded by gates and gravel.

Output: gravel
station
train

Input: Identify the most salient words:

cover image for this book

Output: book
cover
image

Input: Identify the most salient words:

politician at an event to launch of the hotel that was held

Output: event
hold
launch
politician

Input: Identify the most salient words:

lots of lights on a tree in the city

Output:
light
lot
tree