overheadspace
nounUK /ˈəʊvəhedspeɪs/
US /ˈoʊvərhedspeɪs/
The empty room above your head, like the space over a table or under a ceiling.
The balloons floated up into the overheadspace above the table.
OTHER MEANINGS
2. The extra room above something so it can fit without bumping.
The shelf needs more overheadspace so the tall books can stand up.
3. The open sky area above a place.
Birds flew through the overheadspace above the park.
4. The unused area above a machine or vehicle.
The truck has overheadspace for carrying long ladders.