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

Examples
Los niños están jugando bajo la supervisión de sus padres.
The children are playing under the supervision of their parents.
El nuevo empleado necesita un poco de supervisión al principio.
The new employee needs a bit of oversight at the beginning.
La supervisión técnica es fundamental para evitar errores en la obra.
Technical supervision is essential to avoid errors at the construction site.
The -sión Rule
Most words ending in '-sión' or '-ción' are feminine. Always use 'la' or 'una' with this word.
Using 'Bajo'
Just like in English, we use the word 'bajo' (under) to describe someone working 'under' someone else's supervision.
Confusing Noun and Verb
Mistake: “Hacer una supervisar.”
Correction: Hacer una supervisión (or simply 'supervisar'). Use 'supervisión' when you need a naming word (noun), and 'supervisar' when you need an action word (verb).
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