This is the 18053rd most frequent Polish word.
żeglarka
Sailor (female).
Here, 'żeglarka' is used as a noun to refer to a female who practices sailing professionally or as a sport.
Żeglarka zdobyła pierwsze miejsce w regatach.
The female sailor won first place in the regatta.
In this sentence, 'żeglarką' is the instrumental form of 'żeglarka,' indicating the profession or role of the subject.
Moja ciocia jest żeglarką i często opowiada o swoich podróżach.
My aunt is a sailor and often talks about her journeys.
Here, 'żeglarką' is again in the instrumental case, describing the aspiration of the subject to assume this role in the future.