Root ر ه ب(r h b) has 11 unique word forms and appears 12 times in the Quran.

English gloss Fear, Fright, Terror, Monk

Word Translation Occurrences
فَٱرۡهَبُونِ fear [Me], fear [Me], you fear [Me], you fear [Me] 4
رَهۡبَةٗ (in) fear, (in) fear 2
ٱلرَّهۡبِۖ fear, fear 2
وَرَهَبٗاۖ and fear, and fear 2
وَرُهۡبَانٗا and monks, and monks 2
وَرَهۡبَانِيَّةً But monasticism, But monasticism 2
وَرُهۡبَٰنَهُمۡ and their monks, and their monks 2
وَٱسۡتَرۡهَبُوهُمۡ and terrified them, and terrified them 2
وَٱلرُّهۡبَانِ and the monks, and the monks 2
تُرۡهِبُونَ (to) terrify, (to) terrify 2
يَرۡهَبُونَ (are) fearful, (are) fearful 2