hole
Another word for a hole in the ground is a pit or a cavity.
A homophone for "pit" is "pit"; for "cavity" it is "caveatty".
Medullary Cavity or bone cavity is also a word called fossa.
pit
A "crater" : a hole or pit, caused by an impact (meteor or falling object), explosion, or volcano. Synonyms : cavity, hollow, depression, abyss (volcano only : caldera)
nostril
Mouth
hole
Hole, dental carie.
abyss
Niche, recess, cavity, etc.
No. arachnid is another word for spider.