Hole, dental carie.
Medullary Cavity or bone cavity is also a word called fossa.
nostril
Mouth
hole
Another word for a hole in the ground is a pit or a cavity.
Niche, recess, cavity, etc.
Another word that can be used instead of vacuole is cavity. Both are a small hole, filled with fluid.
No. Maybe you want "sinus".
Another name for the medullary cavity of the bone is the marrow cavity.
Oral Cavity
A 'cavity' is a hole in something.
The oral cavity is another name for the mouth.