Input: Identify the most salient words:

coffee being served in a cup

Output: coffee
cup
serve

Input: Identify the most salient words:

lightning hitting the statue of liberty

Output: hit
liberty
lightning
statue

Input: Identify the most salient words:

Sheep flock along a paved highway that i between two grassy hills.

Output: flock
highway
sheep

Input: Identify the most salient words:

vivid green lights from an aurora fill the sky over a city

Output:
aurora
city
sky