Two cases clarify the principle:
زَيْدٌ: a proper name but munṣarif; proper-name status alone does not suffice.
أَحْمَدُ: a proper name with a verb-pattern cause, hence ghayr munṣarif.
Certain causes, including particular plural patterns, have the force of two causes on their own. Each noun must be evaluated under the correct conditions.
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Munṣarif and Ghayr Munṣarif — Definitions, Causes and Parsing
Two cases clarify the principle:
زَيْدٌ: a proper name but munṣarif; proper-name status alone does not suffice.
أَحْمَدُ: a proper name with a verb-pattern cause, hence ghayr munṣarif.
Certain causes, including particular plural patterns, have the force of two causes on their own. Each noun must be evaluated under the correct conditions.