Confused Nouns

Floor and Ground

Rule: Floor is the surface of a room on which we walk; Ground is the surface of the earth outside a building.

Incorrect Usage: (a) His clothes were scattered on the ground of his room.

                             (b) That floor is not fit for building houses.

Correct Usage: (a) His clothes were scattered on the floor of his room.

                          (b) That ground is not fit for building houses.