Input: Identify the most salient words:

pond with pads of water lily

Output: pad
pond
water

Input: Identify the most salient words:

run off the road by sheep

Output: road
run
sheep

Input: Identify the most salient words:

large crowds are expected to pour onto the streets for the procession .

Output: crowd
pour
street

Input: Identify the most salient words:

portrait of politician from a private collection

Output:
collection
politician
portrait