Input: Identify the most salient words:

time lapse of moving moon over the clouds

Output: cloud
lapse
moon
move

Input: Identify the most salient words:

A train pouring out steam through it's smoke stack traveling down railroad tracks.

Output: stack
track
train
travel

Input: Identify the most salient words:

roads and facilities next with bluffs and hills beyond .

Output: bluff
hill
road

Input: Identify the most salient words:

brightly coloured gods and deities at a local temple

Output:
deity
god
temple