This is the 1265th most frequent Russian word.
покупателей
"Buyers" or "customers."
Here, the word 'покупателей' functions as the genitive plural form of 'покупатель', indicating the direct objects being referred to as customers.
Магазин привлекает многих покупателей скидками.
The store attracts many customers with discounts.
In this example, the word 'покупателей' is in the genitive plural form and is used in a possessive sense, describing whose reviews are being discussed.
Отзывы покупателей помогли улучшить качество сервиса.
Customers' reviews helped improve the service quality.
In this usage, 'покупателей' acts as the genitive plural to describe the measure (quantity) of the noun being counted.