Input: Identify the most salient words:

storm clouds over a field of green wheat

Output: field
storm
wheat

Input: Identify the most salient words:

priest celebrate mass at the church

Output: church
mass
priest

Input: Identify the most salient words:

many beautiful new white motor boats and yachts are moored in the bay of the port

Output: moor
port
yacht

Input: Identify the most salient words:

a herd of zebra are grazing on the grass.

Output:
graze
herd
zebra