Input: Identify the most salient words:

doctors taking notes about a scan at the hospital

Output: doctor
hospital
note
take

Input: Identify the most salient words:

mass transportation system carries passengers

Output: carry
passenger
system

Input: Identify the most salient words:

a tug assists the cruise ship headed to the port .

Output: assist
port
tug

Input: Identify the most salient words:

Three men build a room on top of a building.

Output:
build
building
room