This is the 12017th most frequent Polish word.
lekarki
"Lekarki" means "female doctors" in English.
Here, 'lekarki' is the plural form of the feminine noun for doctors, indicating female doctors in general.
Lekarki pracują w szpitalu.
The doctors work in the hospital.
In this sentence, 'lekarki' is used as a singular genitive case of the feminine noun, referring to something belonging to a female doctor.
To jest samochód lekarki.
This is the doctor's car.
Here, 'lekarki' is in instrumental plural case, referring to talking with multiple female doctors.