This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A hollow; a hole.

n. A hollow area within the body: a sinus cavity.

n. A pitted area in a tooth caused by caries.

n. A hole or hollow depression.

n. A hollow area within the body (such as the sinuses).

n. A soft area in a decayed tooth.

n. Hollowness.

n. A hollow place; a hollow.

n. A hollow place; a hollow; a void or empty space in a body: as, the abdominal cavity; the thoracic cavity; the cavity of the mouth.

n. The state of being hollow; hollowness.

n. In horticulture See basin, 12.

n. a sizeable hole (usually in the ground)

n. soft decayed area in a tooth; progressive decay can lead to the death of a tooth

n. (anatomy) a natural hollow or sinus within the body

n. space that is surrounded by something

"Pour the still clear soap into your mold until the cavity is about 2/3 of the way full"

projection    protuberance   

decay   

chamber    consonating cavities    neural    axial cavity    arachnoid cavity    amniotic cavity    cleavage cavity    digital cavity    atrial cavity    cavity tone   

excavation    excavate    excavator    cave    concave   

cavity coupling    cavity fill    cavity impedence    oral cavity    cavity back    cavity radiator    cavity tuning    cavity wall    cavity filter    cavity batten   

hollowness    hollow    hole    hold    sinus    ventriculus    vacuole    bug    well    diverticulum   

depravity    gravity   

cavern    fissure    crater    canal    chamber    tunnel    tube    tissue    vault    hole