Root ر ك ع(r k E) has 10 unique word forms and appears 13 times in the Quran.

English gloss bow down in prayer, kneeling, Prostration

Word Translation Occurrences
ٱلرَّٰكِعِينَ those who bow down 4
وَٱلرُّكَّعِ and those who bow, and those who bow down 4
ٱرۡكَعُواْ Bow 4
ٱلرَّٰكِعُونَ those who bow down 2
وَٱرۡكَعُواْ and bow down 2
وَٱرۡكَعِي and bow down 2
رَاكِعٗاۤ bowing 2
يَرۡكَعُونَ they bow 2
رُكَّعٗا bowing 2
رَٰكِعُونَ (are) those who bow down 2