Stem ظَنُّ has 5 unique word forms and appears 13 times in the Quran.

Word Translation Occurrences
وَظَنُّوٓاْ and they assume, and they thought, and they were certain, and thought 12
ظَنُّ (is the) assumption, (will be the) assumption 4
ظَنُّكُمُ (was) your assumption 2
فَظَنُّوٓاْ and they (will be) certain 2
وَظَنُّواْ and they (will) be certain 2
ظَنُّواْ thought 2
ظَنُّكُم (do) you think 2