Input: Identify the most salient words:

a green spider on his web catching prey

Output: catch
spider
web

Input: Identify the most salient words:

the wreath of willow with the butterfly painting with watercolor

Output: paint
watercolor
wreath

Input: Identify the most salient words:

politician delivers a speech during organisation

Output: deliver
organisation
politician
speech

Input: Identify the most salient words:

students working together in the library with their tutor at the university

Output:
library
student
tutor
university
work