جَاءَ زَيْدٌ also contains two words, but it is a complete sentence: جَاءَ is a verb and زَيْدٌ is its subject. A sentence is excluded from the تركيب cause. Two words must form one proper name, not merely one sentence.
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Important Limitation: A Sentence Is Different
Cause of Ghayr Munsarif: Compound Proper Names
جَاءَ زَيْدٌ also contains two words, but it is a complete sentence: جَاءَ is a verb and زَيْدٌ is its subject. A sentence is excluded from the تركيب cause. Two words must form one proper name, not merely one sentence.