voluminous work; bulky volume; tome
Emphasizes the physical size or length of a book or written work. Often used in formal or academic contexts.
See also: 小著
great work; masterpiece; magnum opus
Focuses on the quality, importance, or scholarly value of a written work. Often used for an author's most significant achievement.
His voluminous work is in three parts and exceeds two thousand pages in total.
This thesis is highly regarded as his magnum opus.