Tambulkhana is the village where Jasim Uddin was born. What type of clause is ‘where Jasim Uddin was born’?

He became rich overnight. What part of speech is 'overnight'?

The nightingale is a singing bird. In this singing is a/an --

I Came home after the rain -----.

The Doctor took the round in the hospital. Here 'round' is a/an ---

Alumni is the plural from of