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:

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

My boss called me on a Saturday to let me know he that due to financial reasons, I was no longer needed effective immediatley. 3 days later, he sends me a text asking about work issues. How do I respond?

—Thomas Jefferson

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

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.

What is the reason that Worcester, Massachusetts is not as well-known as Boston and Springfield, even though it is a large city with many neighborhoods?

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 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.”

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

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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

—Alexis de Tocqueville

What is the most heartbreaking thing your child has told you?

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.

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

—Benjamin Franklin

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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.