floor
- ground
‘floor’
The floor of a room is the flat part you walk on.
The book fell to the floor.
A floor of a building is all the rooms on a particular level.
I went up the stairs to the third floor.
You say that something is on a particular floor.
My office is on the second floor.
Be careful
Don't say that something is ‘in’ a particular floor.
Don't say that something is ‘in’ a particular floor.
‘ground’
You don't normally refer to the surface of the earth as the ‘floor’. You call it the ground.
He set down his backpack on the ground.
The ground was very wet and muddy.
However, the surface of the earth in a forest is sometimes referred to as the forest floor, and the land under the sea is sometimes called the sea floor or the ocean floor.
The forest floor is not rich in vegetation.
Some species are mainly found on the sea floor.