Twofold

DUAL

Think of a word that describes something having two parts or aspects, like a nature of certain-purpose vehicles or a type of citizenship.

Twofold" directly hints at something that comes in pairs or has two parts, which is exactly what "dual" means. The word itself is straightforward—no hidden wordplay or tricks—just a simple definition clue where the answer matches the meaning of the clue. If you think of words like "double" or "twin," "dual" fits perfectly as the concise, four-letter synonym.