This is the 10934th most frequent Polish word.
emerytka
A retired woman.
The word 'emerytka' here is used as a noun, indicating a female retiree.
Moja babcia jest emerytką i cieszy się życiem.
My grandmother is a retiree and enjoys her life.
In this sentence, 'emerytkę' is the accusative singular form of the noun 'emerytka', indicating the direct object of the verb.
Czy widziałeś emerytkę rozmawiającą z tamtym mężczyzną?
Did you see the retiree talking to that man?
In this usage, 'emerytek' is the genitive plural form of 'emerytka', indicating a genitive case in plural form.