Input: Identify the most salient words:

A train makes its way down the tracks.

Output: track
train
way

Input: Identify the most salient words:

the first printed map of rare map with counties and cities

Output: city
county
map

Input: Identify the most salient words:

Someone reaches over and takes the keys.

Output: key
reach
take

Input: Identify the most salient words:

a koi pond with waterfall and a bridge that leads to a gazebo

Output:
bridge
lead
waterfall