Root ف ك ر(f k r) has 6 unique word forms and appears 18 times in the Quran.

English gloss Think, Intellect, Opinion, View, Idea, Reflect

Word Translation Occurrences
يَتَفَكَّرُونَ give thought, reflect, give thought, reflect, who give thought, who ponder, who reflect, who give thought, who ponder, who reflect 20
تَتَفَكَّرُونَ ponder, ponder, you give thought, you give thought 6
تَتَفَكَّرُواْۚ reflect, reflect 2
يَتَفَكَّرُواْ they ponder, they ponder 2
يَتَفَكَّرُواْۗ they reflect, they reflect 2
وَيَتَفَكَّرُونَ and they reflect, and they reflect 2
فَكَّرَ thought, thought 2