Input: Identify the most salient words:

Looking up at a tall clock tower in a blue sky

Output: look
sky
tower

Input: Identify the most salient words:

about the book ... novelist is the author .

Output: author
book
novelist

Input: Identify the most salient words:

trees growing out of the remains of a rotting tree trunk in a temperate rain forest

Output: forest
remain
tree

Input: Identify the most salient words:

site listing category is built

Output:
build
category
list