Input: Identify the most salient words:

politician and his family at the airport

Output: airport
family
politician

Input: Identify the most salient words:

a crane and containers in a port

Output: container
crane
port

Input: Identify the most salient words:

an aircraft comes in to land during a test at an airport

Output: aircraft
airport
come
land

Input: Identify the most salient words:

A train at a station with tracks and gravel.

Output:
gravel
station
train