Which term best describes a structure that holds remains in an above-ground capacity?

The term that best describes a structure that holds remains in an above-ground capacity is "mausoleum." A mausoleum is specifically designed as an above-ground burial space, typically made of stone or marble, and it can house multiple individuals in various compartments or chambers. This distinguishes it from other types of burial practices.

In contrast, a cemetery is a broader term that encompasses a designated area for the burial of the deceased, which can include both above-ground and below-ground options. A lawn crypt, on the other hand, pertains to an underground burial space that offers a certain level of convenience and aesthetics in landscaped areas, and thus does not apply to above-ground structures. Lastly, a flush marker refers to a grave marker that is level with the ground and indicates a burial site, but it does not describe a structure that houses remains. Therefore, the mausoleum is the most accurate term for an above-ground holding structure for remains.