Input: Identify the most salient words:

Several cows leaning over a fence eating hay.

Output: cow
eat
fence
hay

Input: Identify the most salient words:

A group of passengers with luggage walking away from a private plane.

Output: luggage
passenger
plane

Input: Identify the most salient words:

A stoplight showing a green light in a city.

Output: city
light
stoplight

Input: Identify the most salient words:

white clouds float quickly across the blue sky in the summer and sunny day

Output:
cloud
day
sky
summer