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

Why? Try these on for size:

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

Measles Case: Visitors To Mahopac Restaurant May Have Been Exposed, Officials Warn - dailyvoice.com

—Alexis de Tocqueville

—Thomas Jefferson

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.

The Law Firms That Appeased Trump—and Angered Their Clients - WSJ

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

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.

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.

Can someone fall in love with a person they have never met in person, but only through thoughts and imagination?

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

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

I wore a Trump hat to a doctor’s visit. The doctor made a strange comment, he was obviously on the opposite political point that make me uncomfortable. What shall I do on my next visit?

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.

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

What thing happened to you as a child that you haven’t let go of to this day?

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