غ ث وgh-th-w
(ن) غَثَا يَغْثُوْ غَثْوًاghathā yaghthū ghathwan (original form: غَثَوَ يَغْثُوُghathawa yaghthuwu): for a stream or valley to be full of rubbish. (this verb is not used in the Quran).
غُثَآءٌghuthāʾ (noun, ism dhāt; اصلًا غُثَاوٌaṣlan ghuthāw): rotten leaves, straw and the like mixed in the froth of a flood; i.e. a worthless and useless thing. ﴿فَجَعَلَهُۥ غُثَآءً اَحْوٰى﴾ (Al-Aʿlā 87:5); ﴿فَجَعَلْنٰهُمْ غُثَآءً﴾ (Al-Muʾminūn 23:41)