This is the 14803rd most frequent Polish word.
ratownikiem
"Ratownikiem" means "rescuer" or "lifeguard" in English.
In this sentence, "ratownikiem" refers to a person whose occupation involves rescuing people, specifically in the context of the local fire department.
Andrzej jest ratownikiem w lokalnej straży pożarnej.
Andrzej is a rescuer in the local fire department.
Here, "ratownikiem" is used to describe a profession, specifically a mountain rescuer, indicating a specialized field of rescue work.
Zawsze marzyłem, aby zostać ratownikiem górskim i pomagać turystom.
I always dreamed of becoming a mountain rescuer and helping tourists.
In this context, "ratownikiem" refers to a lifeguard, a person responsible for ensuring the safety of swimmers.