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

Why? Try these on for size:

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

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

GM has another affordable EV in the works and it’s not the next-gen Chevy Bolt - Electrek

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.

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

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

How should an atheist respond to a religious person who asks, "Why do you hate God?" What are some appropriate and inappropriate ways to answer this question?

—John Adams

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.

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

What is price of the "liberal celebrities" e.g. Bill Maher, Seth Meyers, Jon Stewart, Trevor Noah, Jimmy Kimmel, Desi Lydic etc. to join the great MAGA movement like Stephen Colbert who wanted to European ambassadorship to turn back on "the Left"?

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.

—Thomas Jefferson

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.”

If you were a writer for HBO, how would you rewrite the final season of Game of Thrones?

—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.

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.

How would you spank me if I had been sent home from a school camp because of my poor behavior?

—Benjamin Franklin