
Cavity
Metaphorical Use
Sometimes 'cavity' is used metaphorically to express emptiness in non-physical things.
The book left a cavity in her heart.
Negative Connotation
'Cavity' often implies a problem or a deficiency needing to be addressed.
The engineers found a cavity in the spacecraft's insulation.
Physical Structures
In construction or architecture, 'cavity' refers to a designed gap within walls.
This building has cavity walls for better insulation.