book.cls:\newcommand\contentsname{Contents} 
book.cls:\newcommand\listfigurename{List of Figures} 
book.cls:\newcommand\listtablename{List of Tables} 
book.cls:\newcommand\bibname{Bibliography} 
book.cls:\newcommand\indexname{Index} 
book.cls:\newcommand\figurename{Figure} 
book.cls:\newcommand\tablename{Table} 
book.cls:\newcommand\partname{Part} 
book.cls:\newcommand\chaptername{Chapter} 
book.cls:\newcommand\appendixname{Appendix}