Input: Identify the most salient words:

airport plays host to an army of small soldiers

Output: airport
army
soldier

Input: Identify the most salient words:

there is a large plane that has landed in the grass

Output: grass
land
plane

Input: Identify the most salient words:

roots of an old tree in a garden covered in moss

Output: cover
moss
root

Input: Identify the most salient words:

students looking at some art

Output:
art
look
student