While the Momina Khatun Mausoleum and other similar monuments are structures of a tower type, Khanagah mausoleum is a structure of the mixed type: its lower part has the cubic form and the upper part is eight-sided.
The Momina Khatun Mausoleum and other similar structures are tower-like, while the Khanagah mausoleum combines elements of both a cube and an octagon.