Input: Identify the most salient words:

christmas tree and decorations in the city

Output: city
decoration
tree

Input: Identify the most salient words:

water being shot in the air from a fountain

Output: fountain
shoot
water

Input: Identify the most salient words:

Four jets flying in close formation with contrails.

Output: contrail
fly
formation

Input: Identify the most salient words:

volcanic activity under meromictic lake produced a cloud of carbon dioxide that asphyxiated villagers

Output:
activity
asphyxiate
dioxide
lake
villager