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

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.

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.

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

How Creatine Became So Popular With Women - WSJ

—Benjamin Franklin

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

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.

It is common sense that Joe Biden is ruining America and is unfit to be president, but why are the liberals still supporting him when Trump is obviously a much better fit for office?

—John Adams

—Alexis de Tocqueville

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.”

Do you agree with a toy company CEO that 'tariffs are almost like speeding towards a brick wall but the driver of the car doesn’t see it yet and by the time he does, it’ll be too late to hit the brakes.'?

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.

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

—Thomas Jefferson

Scientists Just Found the Oldest Barred Spiral Galaxy – And It’s a Monster - SciTechDaily

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

Why? Try these on for size:

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.

Why Disney’s AI Lawsuit Will Determine Whether Studios Survive - The Hollywood Reporter

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