This is the 12334th most frequent Russian word.
казахстанца
The Russian word "казахстанца" means "of a Kazakhstani" or "Kazakhstani's" (possessive form), referring to a person from Kazakhstan.
Here, 'казахстанца' is in the genitive case, which is used for indicating possession or belonging in a grammatical sense.
Я встретил казахстанца в музее.
I met a Kazakhstani in the museum.
In this sentence, 'казахстанца' is following a verb that requires the genitive case, which deals with a relationship of possession in Russian syntax.
Эта книга принадлежит казахстанца.
This book belongs to the Kazakhstani.
In this example, 'казахстанца' refers to a person from Kazakhstan whose achievements are being discussed. This form is in a case showing relationship or reference.