How to Say "respiratory" in Spanish
The Spanish word for “respiratory” is “respiratorio” — A2 level. This is a very common word in everyday Spanish.

Examples
El sistema respiratorio nos permite obtener oxígeno.
The respiratory system allows us to get oxygen.
Ella tiene una alergia respiratoria durante la primavera.
She has a respiratory allergy during the spring.
Los médicos estudian las enfermedades respiratorias crónicas.
Doctors study chronic respiratory diseases.
Matching the Noun
Since this is a describing word, its ending must change to match the thing it describes. Use 'respiratorio' for masculine words (el sistema) and 'respiratoria' for feminine words (la vía).
Word Placement
In Spanish, this word almost always comes after the noun it describes, unlike in English where 'respiratory' comes before.
Describing the machine
Mistake: “El paciente necesita un respiratorio.”
Correction: El paciente necesita un respirador.
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