English language is so varied that it sometimes leaves you wondering how can one remember so much! That’s true, but this is why you have Everyday Cup of English.
The word ‘people‘ is such a plain simple word. But see how it takes different names at different places:
At a match or tournament you call them Spectators
In the riots you call them Mob
At a lecture or concert you call them Audience
In a temple, mosque or church you call them Congregation
In the streets you call them Crowd
If gathered for a common purpose as in parliament, you call them Assembly
So, you see, how varied English language is.