الْمُرَادُ بِالْكَلَامِ مَا لَيْسَ بِكَلِمَةٍ
Here kalam means an expression that is not a single word.
In this setting, kalam is used more broadly than the restrictive grammatical sense of an independently complete statement. A composite expression can be evaluated even if it does not constitute a full predication.
ExpressionStructure
قَامَ زَيْدٌComplete predication
غُلَامُ زَيْدٍGenitive phrase, not a complete statement
Keeping this usage distinct from narrower grammatical terminology prevents confusion.