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

Why? Try these on for size:

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

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.”

How do schizophrenia symptoms change throughout the day?

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.

—Thomas Jefferson

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

Are you offended if Democrats call Republicans "weird"?

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.

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

You found a love potion, and your friend tried to use it on an attractive popular girl, but he accidentally dropped it on the neighbors dog. Now the dog won't stop following him. How would you help him?

—Benjamin Franklin

—Alexis de Tocqueville

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.

Why did my crush like me for only two days in a row?

—John Adams

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

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.

Why does my intimate area “sweat” and smell so much? I almost have to have a shower everyday. How do I get rid of this?

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