Choose the appropriate word which can be substituted for the given sentence: $A$ child born after the death of his father.

Choose the appropriate word which can be substituted for the given sentence: 'Occurring at night'.

Choose the appropriate word which can be substituted for the given sentence: $A$ person who travels on foot.

Choose the appropriate word which can be substituted for the given sentence: The yearly return of a date or an event like a birthday,day of marriage,etc.

Choose the appropriate word which can be substituted for the given sentence: 'State in which the few govern the many'.

Choose the appropriate word which can be substituted for the given sentence: '$A$ person who insists on a certain quality or strictly follows a specific behavior'.