How is "nosh"different from "eat"?Thanks
I would appreciate some distinguishing examples in which it's eating but not noshing or the other way round.Thank you.

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The word "eat" has a more general meaning, we can eat all kinds of food. 
The word "nosh" is usually referred to snacks and to light food.

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The verb 'to eat' is *much* more common than 'to nosh'. To be honest, I did not know the exact meaning of 'nosh' until I read here comment above. 'To nosh' is possibly from Yiddish but I don't know. Yiddish is a European Germanic language spoken mostly within the Jewish culture.