A sound morphological analysis of ism al-ẓarf checks root, imperfect, pattern and meaning.
Word / formMeaning / explanation
يَضْرِبُ ← مَضْرِبٌsimple triliteral, mafʿil, with kasrah retained.
يَنْصُرُ ← مَنْصَرٌsimple triliteral, mafʿal, with ḍammah replaced by fatḥah.
يُقْتَتَلُ ← مُقْتَتَلٌaugmented form using the passive-participle shape.
The decisive semantic question is whether the word denotes the place or time of an action rather than another kind of derivative.