Input: Identify the most salient words:

water flowing in a drain

Output: drain
flow
water

Input: Identify the most salient words:

workers hang red banners beside a huge poster of philosopher

Output: banner
hang
philosopher
poster
worker

Input: Identify the most salient words:

cloud moving over the city

Output: city
cloud
move

Input: Identify the most salient words:

a disturbing book that takes you to a different world and time .

Output:
take
time
world