Input: Identify the most salient words:

american football player tries to avoid a tackle by athlete .

Output: athlete
avoid
player

Input: Identify the most salient words:

time lapse of a sunrise with colourful movement of cloud and its reflection

Output: cloud
movement
sunrise

Input: Identify the most salient words:

A train engine and several cars moving along a track in a city.

Output: car
city
move
track

Input: Identify the most salient words:

an adaptation is a feature that allow an organism to better survive in its environment .

Output:
adaptation
allow
organism