What single word do these all these have in common: gemstones, baseball fields, and playing cards?

Escape artist Harry Houdini died of what causes?

If someone suffers from "myopia", what can they not do well?

The words nadir and zenith: do they have the same or opposite meaning?

Find a common nine letter word with one syllable.

When visiting an ancient city in Greece or Egypt, if you visited a necropolis, what did you visit?

What is the national motto of the United States?