This is the 13559th most frequent Polish word.
piosenkarz
Singer.
Here, 'piosenkarz' is used as a noun referring to a male singer.
Ten piosenkarz ma piękny głos.
This singer has a beautiful voice.
'piosenkarz' (in the instrumental case 'piosenkarzem') is used to signify a profession or aspiration.
Moja siostra chciałaby zostać sławnym piosenkarzem.
My sister would like to become a famous singer.
In this sentence, 'piosenkarza' is in the accusative case, indicating a direct object of the verb.