Input: Identify the most salient words:

Two cats looking at one another through glass

Output: cat
glass
look

Input: Identify the most salient words:

time lapse of clouds over tourist attraction

Output: attraction
cloud
lapse

Input: Identify the most salient words:

flags were seen flying at half mast from the roof this evening in honour of person

Output: flag
fly
mast
roof

Input: Identify the most salient words:

old fortress in island by the sea on sunny day

Output:
day
island
sea