ElementFirst clauseSecond clause
SubjectZaydʿAmr
PredicatePoetWriter
«زَيْدٌ شَاعِرٌ وَعَمْرٌو كَاتِبٌ»
Zayd is a poet, and ʿAmr is a writer.
The predicates share a literary field. If the two people are also connected by companionship, scholarly activity, or a relevant occasion, their subjects have a contextual affinity as well. Merely mentioning two personal names does not by itself establish a good unifying relation.