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

Why? Try these on for size:

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

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

What are the most extreme examples of hypocrisy?

—Thomas Jefferson

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

—John Adams

Which unexpected celebrity has done a bold or revealing photoshoot?

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.

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 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.”

My stepmother has banned me from the family. Can she legally keep me from going to my father's funeral?

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.

—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.

How did the DMK alliance manage to keep the BJP out of Tamil Nadu politics all these years? Is the picture now changing in Tamil Nadu after the entry of Annamalai?

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

—Benjamin Franklin

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

What advice would you give to a father of a teenage daughter on how to protect her from boys, dating, and social media? How should fathers discuss these topics with their daughters?

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.