Input: Identify the most salient words:

storm clouds roll over a valley shrouded in dense forest

Output: cloud
roll
valley

Input: Identify the most salient words:

The farmer is plowing his field.

Output: farmer
field
plow

Input: Identify the most salient words:

duck and ducklings in a row

Output: duck
duckling
row

Input: Identify the most salient words:

A half eaten pepper and mushroom pizza on a metal tray.

Output:
eat
mushroom
pepper
pizza