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]

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

Why cant school buses ditch kids who are late to the bus at the school? Like on the way home, if a kid is late when all the others arrived to the bus on time, why cant they leave the late kid behind since its not fair to the on time kids to wait?

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

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.

—Alexis de Tocqueville

Have you ever had a weird experience immediately following the death of a loved one that made you think there is an afterlife and that the deceased person was communicating with you?

—Thomas Jefferson

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.

—John Adams

Why do men cheat on their wives with someone extremely unattractive?

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.

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

Why does it matter so much to atheists that God doesn't exist?

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

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.

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 do liberals and Democrats think it’s “ironic” for Donald Trump to say “We have to get back to law and order”?

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