وليس هذا نزاعا لفظيا
This is not a merely verbal disagreement.
If one person chose the name body for two joined parts and another chose a different name for exactly the same concept, the dispute would be terminological. The actual question is whether the meaning signified by “body” is realized through two joined parts.
Verbal dispute: different labels for one agreed notion.
Substantive dispute: disagreement over the nature or essential condition of the notion.
The distinction locates the subsequent argument correctly.