"Mausoleum" refers to the underground part, that is, "the ground is the mausoleum, and the underground is the tomb", which is collectively called "Mausoleum" or "grave" with the above-ground part. In ancient times, before the Qin and Han Dynasties, there was a saying that "the tomb replaced the grave", so the "tomb" was generally flat and not higher than the ground, while the "grave" was a mound piled on the tomb as a mark.
After the death of the emperor, it is well known that there are tombs, such as the Mausoleum of the First Qin Emperor, the Mausoleum of the Yellow Emperor and the Ming Tombs. However, people in special periods are also called "tombs" because their status, contribution or fame are almost equal to those of the emperor. For example, the tomb of Dr. Sun Yat-sen in Nanjing is called Sun Yat-sen Mausoleum, and the body of Guan Yu in Dangyang, Hubei Province is buried in Guanling. There is no problem in using "tombs" for princes. The original meaning of "tomb" is high grave, and Cao Cao's tomb is considered to be within the "72 suspected graves".