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

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:

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

Two of my family members have recently converted to Islam and have brought shame on my family. How do I get them back into the fold of Hinduism?

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.

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

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.

New Apple study challenges whether AI models truly “reason” through problems - Ars Technica

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.

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

What’s the worst thing you caught anyone in your family doing?

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.”

—Benjamin Franklin

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.

What is better, 4 more years of Trump with the media trying to hurt him, or 8 years of DeSantis with the media licking booty, or 4 to 8 years of RFK with the media hating on him all the time? (Biden is not an option, he can't win)

—Alexis de Tocqueville

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.

—Thomas Jefferson

How does a 45-year-old man get a girlfriend?

—John Adams