Root ص و م(S w m) has 9 unique word forms and appears 14 times in the Quran.

Word Translation Occurrences
فَصِيَامُ then fasting, then a fast, (that),then fasting, (that), then fasting 8
صَوۡمٗا a fast 2
صِيَامٍ fasting 2
صِيَامٗا (in) fasting 2
فَلۡيَصُمۡهُۖ then he should fast in it 2
ٱلصِّيَامَ the fast 2
ٱلصِّيَامُ [the] fasting 2
ٱلصِّيَامِ (of) fasting 2
وَٱلصَّٰٓئِمَٰتِ and the women who fast 2
تَصُومُواْ fast 2
وَٱلصَّٰٓئِمِينَ and the men who fast 2