Input: Identify the most salient words:

sunset and clouds moving in the city time lapse

Output: cloud
lapse
move
sunset

Input: Identify the most salient words:

clouds pass by rapidly in a blue sky

Output: cloud
pass
sky

Input: Identify the most salient words:

the flower from biological species rests on volcanic rock

Output: rest
rock
specie

Input: Identify the most salient words:

young mother showing to her baby the autumn colored leaves

Output:
autumn
color
leave