Input: Identify the most salient words:

a large plane sits on a runway not flying

Output: fly
plane
runway
sit

Input: Identify the most salient words:

a placid lake is surrounded by mountains in the mountain range

Output: lake
range
surround

Input: Identify the most salient words:

working tug boat guiding a large container ship through the narrow entrance of harbour

Output: boat
harbour
ship

Input: Identify the most salient words:

rugby player and athlete combine to tackle athlete during the semi final match .

Output:
athlete
combine
match