a joke or misunderstanding...
Eighteenth-Century Studies was created in 1966.
Orchestra of the Eighteenth Century was created in 1981.
Eighteenth Army - Japan - was created in 1942.
Eighteenth Army - Japan - ended in 1945.
The eighteenth sultan of the Ottoman Empire was Ibrahim I.
Yes, the noun 'eighteenth' is a common noun, a general word for any person or thing that is number 18 in a series. The word 'eighteenth' is also an adjective when used to describe a noun. Examples: School starts on the eighteenth of the month. (noun) We celebrated his eighteenth birthday. (adjective)
Music from Eighteenth-Century Prague was created in 2009.
Eighteenth Amendment of the Constitution of Ireland happened in 1998.
The Eighteenth Brumaire of Louis Napoleon was created in 1869.
Japanese Eighteenth Area Army ended in 1945.
Japanese Eighteenth Area Army was created in 1943.
The eighteenth amendment officially started the Prohibition Era, declaring alcohol illegal.