Compare the vocative azaydu with interrogative a-zaydun ḥāḍirun. The noun after vocative a is a munādā; after interrogative hamza it is an ordinary nominal subject.
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Vocative Hamza versus Question Hamza
Vocative Particles: Five Forms, Uses and Parsing
Compare the vocative azaydu with interrogative a-zaydun ḥāḍirun. The noun after vocative a is a munādā; after interrogative hamza it is an ordinary nominal subject.