Where does “lubownik” come from?

lubownik (Polish) comes from Polish -ownik, from Old Polish -nik, from Proto-Slavic -nikъ — From the deverbial noun stem of imperfect verbs,...

Ancestry of “lubownik”, step by step

Step	Language	Word	Meaning
1	Polish	-ownik	Forms masculine nouns
2	Old Polish	-nik	forms masculine nouns referring to a performer of some action, sometimes a device
3	Proto-Slavic	-nikъ	From the deverbial noun stem of imperfect verbs,...