Input: Identify the most salient words:

a skier changes direction as he skis downwards

Output: direction
ski
skier

Input: Identify the most salient words:

lichens and moss growing on volcanic rock

Output: grow
moss
rock

Input: Identify the most salient words:

costa makes his feelings known as football team go behind in their clash

Output: costa
feeling
know

Input: Identify the most salient words:

An old non moving train sitting in station.

Output:
move
station
train