Choose the appropriate word which can be substituted for the given sentence: $A$ person who speaks many languages.

Choose the appropriate word which can be substituted for the given sentence: 'One who eats everything'.

Choose the appropriate word which can be substituted for the given sentence: 'Habitually silent or talking little'.

Choose the appropriate word which can be substituted for the given sentence: 'Medical study of skin and its diseases'.

Choose the appropriate word which can be substituted for the given sentence: $A$ country that is ruled by a king or queen.

Choose the appropriate word which can be substituted for the given sentence: 'One absorbed in his own thoughts and feelings rather than in things outside'.