Just a little overview of why Trademarking a Word in the title of your book is not the protection that authors are allowed to.
seen from Germany

seen from France
seen from United States
seen from Pakistan
seen from Ireland

seen from United States
seen from South Korea

seen from Ireland

seen from United States

seen from Australia

seen from United States
seen from Indonesia

seen from Türkiye
seen from Singapore
seen from Türkiye
seen from China
seen from China
seen from United States
seen from Türkiye
seen from United States
Just a little overview of why Trademarking a Word in the title of your book is not the protection that authors are allowed to.