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

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.

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

Why? Try these on for size:

Robotic table tennis system predicts ball trajectory and adapts swing in real time - Tech Xplore

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

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.

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

Why does my dog keep licking at her privates now? She is 7 years old and has barely started licking there. The vet said she’s fine but she keeps doing that.

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.

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

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

Scottie Scheffler’s wife reveals infant son’s bathroom mishap during Memorial win - New York Post

—John Adams

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.

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.

A Giant Mouth Has Opened on The Sun And Even It Looks Surprised - ScienceAlert

—Alexis de Tocqueville

—Thomas Jefferson

—Benjamin Franklin

How do you recognize when your mental health might need attention?

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.”