Input: Identify the most salient words:

time lapse of clouds streaming through a valley to the sea

Output: cloud
sea
stream

Input: Identify the most salient words:

parents and pupils are warned the school will be closed until the building is made safe

Output: parent
pupil
school

Input: Identify the most salient words:

an image taken at beach at sunset as the sun was just dipping the horizon

Output: beach
horizon
sun
sunset

Input: Identify the most salient words:

heavy clouds hang over a city this morning as the city waits for snow .

Output:
city
cloud
hang