Why is the word "democracy" not in the preamble of the US Constitution?

[with republicanism being the rights-protecting form of governance afforded us by our Constitution]

Why? Try these on for size:

When the people find they can vote themselves money, that will herald the end of the republic.

Have you ever met someone and something seemed so unusual about them but you couldn't put your finger on what it was?

—Thomas Jefferson

Another tendency, which is extremely natural to democratic nations and extremely dangerous, is that which leads them to despise and undervalue the rights of private persons.

—John Adams

Why does Russia and many parts of Eastern Europe strangely have a high percentage of female doctors and physicians (~70%)?

The republican is the only form of government which is not eternally at open or secret war with the rights of mankind.

In other words, our Founding Fathers and other Whig intellects of that time well understood that democratic methods are the surefire means to do serious damage to the rights guaranteed under republican self-government.

—Benjamin Franklin

What is the reason behind some people referring to themselves as "nice guys" instead of simply being nice?

To blacks: “You can’t drink from that water fountain… eat in this cafeteria… ride this bus… go to this school. We voted fair and square and your side lost.

To Indians: “Pack up what belongings you can carry and start walking to Oklahoma. Your fertile lands are ours now. We voted fair and square and your side lost.”

To slaves: “You can forget your notions of freedom. We voted fair and square and your side lost.”

What are some funny stories of people calling 911 for non-emergencies?

Meanwhile, when the Democratic Party formed in 1828, it was with a Tory outlook keen on robbing others of their rights:

I do not say that democracy has been more pernicious on the whole, and in the long run, than monarchy or aristocracy. Democracy has never been and never can be so durable as aristocracy or monarchy; but while it lasts, it is more bloody than either.

—Alexis de Tocqueville

Why do I randomly start sweating a lot in public (while waiting in line, in a new class, etc.) then start sweating more because I’m embarrassed that I’m sweating so much? Is this social anxiety?

Majority-rules democracy is the way that majorities run roughshod over minorities, destroying rights and all ideas of equality under the law. No fair-minded person wants anything to do with democracy.