Input: Identify the most salient words:

the cog is grazing on the grass, he has big horns

Output: grass
graze
horn

Input: Identify the most salient words:

Smoke is coming out of a train engine on the tracks.

Output: engine
smoke
track

Input: Identify the most salient words:

A tall giraffe in a zoo eating branches

Output: branch
giraffe
zoo

Input: Identify the most salient words:

boat moored on the harbour

Output:
boat
harbour
moor