Root ر ك ن(r k n) has 4 unique word forms and appears 4 times in the Quran.

English gloss Calm, Support, Element, Firm

Word Translation Occurrences
بِرُكۡنِهِۦ with his supporters, with his supporters 2
تَرۡكَنُ (would) have inclined, (would) have inclined 2
تَرۡكَنُوٓاْ incline, incline 2
رُكۡنٖ a support, a support 2