Input: Identify the most salient words:

rapid formation of clouds near the mountains in the sun

Output: cloud
formation
mountain

Input: Identify the most salient words:

a grizzly bear before it goes to its den to sleep until spring .

Output: bear
den
sleep

Input: Identify the most salient words:

add a zipper to existing sweater for visual interest .

Output: add
interest
sweater

Input: Identify the most salient words:

a field nestled among the hills .

Output:
field
hill
nestle