How to Say "top-priority" in Spanish
The Spanish word for “top-priority” is “prioritario” — B1 level. This is a very common word in everyday Spanish.

Examples
Este proyecto es prioritario para la empresa.
This project is a priority for the company.
Debemos dar atención prioritaria a las personas mayores.
We must give priority attention to elderly people.
El gobierno ha definido sus objetivos prioritarios para este año.
The government has defined its priority objectives for this year.
Placement after the noun
In Spanish, you usually put 'prioritario' after the person or thing you are describing, like 'un asunto prioritario' (a priority matter).
Matching gender and number
The ending changes to 'prioritaria' for feminine words and adds an 's' for plurals (prioritarios/prioritarias).
Adjective vs. Noun
Mistake: “Esto es una prioritario.”
Correction: Esto es una prioridad (noun) or Esto es prioritario (adjective). Use 'prioridad' for 'the priority' and 'prioritario' for 'is a priority'.
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