listening, audition, perceiving, earshot, attention, heed, awareness, comprehension, understanding, reception, sense, detection, monitoring, overhearing, eavesdropping, auscultation, auditory percepti... [more]
hole - hollow - void - pit - gap - space - depression - chamber - pocket - recess - concavity - indentation - niche - alcove - crater - fissure - aperture - opening - cleft - chasm - rift - crevice - groove - trench - burrow - tunnel - excavation - bore - perforation - dent - dimple - socket - sinus - cell - compartment - hollow space - lacuna - vacuity - abyss - gulf - hollow area - hollow part - hollow section - hollow region - hollow cavity - hollow chamber - hollow pocket - hollow recess - hollow niche
A cavity is a hollow space within a solid object, often referring to a decayed area in a tooth caused by bacterial infection. It can also colloquially mean any type of hollow inside a body or a physical structure. In dentistry, it's the result of demineralization and destruction of the enamel, leading to pain and dental issues if left untreated.