Word / formMeaning / explanation
بُعْثِرَit was scattered; passive perfect.
يُبَعْثَرُit is scattered; passive imperfect.
مُبَعْثَرٌscattered or dispersed; passive participle.
مُبَعْثِرٌone who scatters; active participle.
The root b-ʿ-th-r remains unchanged. Vowels shift the focus from the agent to the recipient. In مُبَعْثِر, kasrah before the final radical marks the active participle; in مُبَعْثَر, fatḥah marks the passive participle.