أَبِي لَهَبٍ ... نَارًا ذَاتَ لَهَبٍ
Abu Lahab ... a fire possessing flame. (111:1, 3)
Abū Lahab is a known appellation; lahab in verse 3 is the noun 'flame'. Reappearance of the same lexical material ties a designation to an image of consequence. This can be studied as lexical resonance supporting the context’s meaning.
Sound likeness does not by itself establish the substance of the judgment. The first lahab is the genitive complement of the appellation; the later lahab complements dhāt in a separate grammatical structure.