This is the 3969th most frequent Russian word.
здание
Building.
The word 'здание' is used as a noun to refer to a physical structure, a building in general.
Это здание было построено в прошлом году.
This building was constructed last year.
Here, 'здание' is again a noun referring to the building, used in the context of its design or architectural characteristics.
Архитектор описал здание как современное.
The architect described the building as modern.
In this sentence, 'здание' represents the topic of discussion, emphasizing the detailed observation of an aspect of the building.