Comparing the two forms of padding

Ījāz, Iṭnāb and Musāwāt: Standards of Expression and Their Distinctions

TypeEffect of surplus wordingAssessment
Damaging ḥashwDistorts the intended relation or meaningSemantic defect
Non-damaging ḥashwLeaves meaning but adds no benefitIdle surplus
Useful iṭnābAdds clarification, emphasis or another benefitContextually justified expansion

Classification depends on real communicative benefit, not a numerical count of additional words.