Root ر د ف(r d f) has 3 unique word forms and appears 3 times in the Quran.

English gloss Follow, Succeed, Follow one another, Synonymous

Word Translation Occurrences
رَدِفَ close behind, <span class='v'>close</span> <span class='v'>behind</span> 2
ٱلرَّادِفَةُ <span class='n'>the</span> <span class='n'>subsequent</span>, the subsequent 2
مُرۡدِفِينَ one after another, <span class='n'>one</span> <span class='n'>after</span> <span class='n'>another</span> 2