• زَان
• زَانِيَة
• زِّنَىٰٓ
• يَزْنُونَ
• يَزْنِينَ

Appears 5 times in the Quran.

1. 17:32 وَلَا تَقْرَبُوا۟ ٱلزِّنَىٰٓ إِنَّهُۥ كَانَ فَٰحِشَةً وَسَآءَ سَبِيلًا

   And go not nigh to fornication; surely it is an indecency and an evil way.
   

2. 24:2 ٱلزَّانِيَةُ وَٱلزَّانِى فَٱجْلِدُوا۟ كُلَّ وَٰحِدٍ مِّنْهُمَا مِا۟ئَةَ جَلْدَةٍ وَلَا تَأْخُذْكُم بِهِمَا رَأْفَةٌ فِى دِينِ ٱللَّهِ إِن كُنتُمْ تُؤْمِنُونَ بِٱللَّهِ وَٱلْيَوْمِ ٱلْءَاخِرِ وَلْيَشْهَدْ عَذَابَهُمَا طَآئِفَةٌ مِّنَ ٱلْمُؤْمِنِينَ

   (As for) the fornicatress and the fornicator, flog each of them, (giving) a hundred stripes, and let not pity for them detain you in the matter of obedience to Allah, if you believe in Allah and the last day, and let a party of believers witness their chastisement.
   

3. 24:3 ٱلزَّانِى لَا يَنكِحُ إِلَّا زَانِيَةً أَوْ مُشْرِكَةً وَٱلزَّانِيَةُ لَا يَنكِحُهَآ إِلَّا زَانٍ أَوْ مُشْرِكٌ وَحُرِّمَ ذَٰلِكَ عَلَى ٱلْمُؤْمِنِينَ

   The fornicator shall not marry any but a fornicatress or idolatress, and (as for) the fornicatress, none shall marry her but a fornicator or an idolater; and it is forbidden to the believers.
   

4. 25:68 وَٱلَّذِينَ لَا يَدْعُونَ مَعَ ٱللَّهِ إِلَٰهًا ءَاخَرَ وَلَا يَقْتُلُونَ ٱلنَّفْسَ ٱلَّتِى حَرَّمَ ٱللَّهُ إِلَّا بِٱلْحَقِّ وَلَا يَزْنُونَ وَمَن يَفْعَلْ ذَٰلِكَ يَلْقَ أَثَامًا

   And they who do not call upon another god with Allah and do not slay the soul, which Allah has forbidden except in the requirements of justice, and (who) do not commit fornication and he who does this shall find a requital of sin;
   

5. 60:12 يَٰٓأَيُّهَا ٱلنَّبِىُّ إِذَا جَآءَكَ ٱلْمُؤْمِنَٰتُ يُبَايِعْنَكَ عَلَىٰٓ أَن لَّا يُشْرِكْنَ بِٱللَّهِ شَيْـًٔا وَلَا يَسْرِقْنَ وَلَا يَزْنِينَ وَلَا يَقْتُلْنَ أَوْلَٰدَهُنَّ وَلَا يَأْتِينَ بِبُهْتَٰنٍ يَفْتَرِينَهُۥ بَيْنَ أَيْدِيهِنَّ وَأَرْجُلِهِنَّ وَلَا يَعْصِينَكَ فِى مَعْرُوفٍ فَبَايِعْهُنَّ وَٱسْتَغْفِرْ لَهُنَّ ٱللَّهَ إِنَّ ٱللَّهَ غَفُورٌ رَّحِيمٌ

   O Prophet! when believing women come to you giving you a pledge that they will not associate aught with Allah, and will not steal, and will not commit fornication, and will not kill their children, and will not bring a calumny which they have forged of themselves, and will not disobey you in what is good, accept their pledge, and ask forgiveness for them from Allah; surely Allah is Forgiving, Merciful.