Root ر ب ع(r b E) has 7 unique word forms and appears 22 times in the Quran.

English gloss Commence, Home, Residence, 3 rd and 4th month of Islamic year

Word Translation Occurrences
أَرۡبَعِينَ (for) forty, forty, (of) forty 8
بِأَرۡبَعَةِ four 4
أَرۡبَعَةَ (during) four, (for) four 4
أَرۡبَعَةِ four 4
ٱلرُّبُعُ (is) the fourth 4
أَرۡبَعَةٗ four 4
وَرُبَٰعَۖ or four 2
أَرۡبَعَ four 2
وَرُبَٰعَۚ or four 2
أَرۡبَعُ (is) four 2
أَرۡبَعٖۚ four 2
أَرۡبَعَةٌ four 2
رَابِعُهُمۡ (the) fourth of them 2
رَّابِعُهُمۡ the forth of them 2