How to Say "healthcare worker" in Spanish
The Spanish word for “healthcare worker” is “sanitario” — B1 level. This is a very common word in everyday Spanish.

Examples
Los sanitarios trabajaron muchas horas durante la emergencia.
The healthcare workers worked many hours during the emergency.
El fontanero está arreglando el sanitario.
The plumber is fixing the toilet.
Ella es una sanitaria con mucha experiencia.
She is a healthcare professional with a lot of experience.
People vs. Objects
When referring to a person, it can be 'el sanitario' (male) or 'la sanitaria' (female). When referring to a toilet, it is almost always masculine 'el sanitario'.
Is it a doctor?
Mistake: “Using 'sanitario' to mean only 'doctor'.”
Correction: A 'sanitario' can be a doctor, a nurse, or an ambulance driver. It is a general term for anyone in the health field.
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