(ک) كَثُرَ يَكْثُرُ كَثْرَةًkathura yakthuru kathratan: to be many in number. ﴿مِمَّا قَلَّ مِنْهُ اَوْ كَثُرَ﴾ (An-Nisāʾ 4:7)
كَثْرَةٌkathrah (noun, ism dhāt): abundance, multitude. ﴿اِذْ اَعْجَبَتْكُمْ كَثْرَتُكُمْ﴾ (At-Tawbah 9:25)
كَثِيْرٌkathīr (adjective on the pattern of فَعِيْلٌfaʿīl): many, much. ﴿وَاذْكُرُوا اللّٰهَ كَثِيْرًا﴾ (Al-Anfāl 8:45)
اَكْثَرُaktharu (elative, ism tafḍīl): most, the majority. ﴿وَلٰكِنَّ اَكْثَرَ النَّاسِ لَا يَعْلَمُوْنَ﴾ (Yūsuf 12:21)
كَوْثَرٌkawthar (intensive form on the pattern of فَوْعَلٌfawʿal): utmost abundance, abundant good. ﴿اِنَّآ اَعْطَيْنٰكَ الْكَوْثَرَ﴾ (Al-Kawthar 108:1)
Form IV (ifʿāl) اَكْثَرَ يُكْثِرُ اِكْثَارًاakthara yukthiru ikthāran: to make many, to increase. ﴿فَاَكْثَرُوْا فِيْهَا الْفَسَادَ﴾ (Al-Fajr 89:12)
Form II (tafʿīl) كَثَّرَ يُكَثِّرُ تَكْثِيْرًاkaththara yukaththiru takthīran: to increase gradually. ﴿وَاذْكُرُوْٓا اِذْ كُنْتُمْ قَلِيْلًا فَكَثَّرَكُمْ﴾ (Al-Aʿrāf 7:86)
Form VI (tafāʿul) تَكَاثَرَ يَتَكَاثَرُ تَكَاثُرًاtakāthara yatakātharu takāthuran: to vie with one another in abundance. ﴿اَلْهٰكُمُ التَّكَاثُرُ﴾ (At-Takāthur 102:1)
Form X (istifʿāl) اِسْتَكْثَرَ يَسْتَكْثِرُ اِسْتِكْثَارًاistakthara yastakthiru istikthāran: to desire more, to consider (what one has given) much. ﴿وَلَا تَمْنُنْ تَسْتَكْثِرُ﴾ (Al-Muddaththir 74:6)