Input: Identify the most salient words:

a herd of goats gather .

Output: gather
goat
herd

Input: Identify the most salient words:

looking at tomatoes growing in the garden .

Output: garden
grow
tomato

Input: Identify the most salient words:

A room with chairs, a fireplace, a mantle and a couch.

Output: couch
mantle
room

Input: Identify the most salient words:

The airplane has two propeller on each wing.

Output:
airplane
propeller
wing