Input: Identify the most salient words:

skyscraper is being built on the site .

Output: build
site
skyscraper

Input: Identify the most salient words:

real time locked down medium shot of the building .

Output: building
lock
shot

Input: Identify the most salient words:

Plane in airport preparing to take off or to approach gate for boarding.

Output: board
gate
plane

Input: Identify the most salient words:

isometric map of the city with buildings and trains

Output:
building
city
map