This is the 2387th most frequent Russian word.
орган
"Organ" (body part, musical instrument, or official institution/agency).
Here, 'organ' refers to a musical instrument, specifically a pipe organ often used in classical music and religious settings.
Музыкант играет на старинном органе в соборе.
The musician plays an antique organ in the cathedral.
In this sentence, 'organ' pertains to a part of the body that has a specific function, such as the heart or liver.
Сердце — это важный орган человеческого тела.
The heart is an important organ of the human body.
Here, 'орган' means an administrative or governmental body, such as an institution or department responsible for municipal functions.