There is no strict cut-off point. In most cases, ten people is not really a crowd. But 100 people usually is.
The conceptual difference is when you stop noticing the individuals and only see the group. But this is not a rule of English. If you consider other languages that you know, you will notice that words like "crowd" are not (usually) defined exactly as a particular number
this certainly goes against 'the class clown'
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