This is the 5813th most frequent Russian word.
рабочее
"Рабочее" means "working" or "work-related."
The word "рабочее" is used as an adjective related to work, modifying the noun "материала".
У меня сегодня много рабочего материала.
I have a lot of work-related material today.
In this case, "рабочее место" refers to the physical location related to work, using "рабочее" as an adjective.
Рабочее место должно быть удобным и эргономичным.
The workplace should be comfortable and ergonomic.
Here, "рабочее" modifies "время" to describe the time dedicated to work.