We don't have synonyms for world war 1 yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are world war i, world war 2 and world war ii.
(n) :
Alternative form of World War I. [(history) The war from 1914 to 1918 between the Entente Powers of the British Empire, Russian Empire, France, Italy, the United States and other allied nations, against the Central Powers represented by the German Empire, Austria-Hungary, the Ottoman Empire, and Bulgaria.]
(n) :
Alternative form of World War I. [(history) The war from 1914 to 1918 between the Entente Powers of the British Empire, Russian Empire, France, Italy, the United States and other allied nations, against the Central Powers represented by the German Empire, Austria-Hungary, the Ottoman Empire, and Bulgaria.]