Odd Man Out

Brick, Cement and Sand are the raw materials for the building a Wall.

In all other pairs, sum of the two numbers is 8.

All except Dog are wild animals.

All other are parts of a tree.

In all other pairs, first number is 9 times the second.

All others are different types of ornaments.

In the other groups, there is a gap of 3 letters in between first and second letter.

All except Sun are planets, while Sun is a star.

All other groups consist of four consecutive letters, though not in order.

In all other pairs, the product of the two numbers is 126.