Input: Identify the most salient words:

white clouds before rain running quickly across the sky

Output: cloud
rain
run

Input: Identify the most salient words:

Downtown road empty during the day with palm trees on it.

Output: day
road
tree

Input: Identify the most salient words:

wildflowers sway in the breeze against a cloudy blue sky in an empty field

Output: breeze
field
sky

Input: Identify the most salient words:

protected site under the moon and stars

Output:
moon
protect
site