• حُوت
• حُوتهُمْ
• حُوتهُمَا

Appears 5 times in the Quran.

1. 7:163 وَسْـَٔلْهُمْ عَنِ ٱلْقَرْيَةِ ٱلَّتِى كَانَتْ حَاضِرَةَ ٱلْبَحْرِ إِذْ يَعْدُونَ فِى ٱلسَّبْتِ إِذْ تَأْتِيهِمْ حِيتَانُهُمْ يَوْمَ سَبْتِهِمْ شُرَّعًا وَيَوْمَ لَا يَسْبِتُونَ لَا تَأْتِيهِمْ كَذَٰلِكَ نَبْلُوهُم بِمَا كَانُوا۟ يَفْسُقُونَ

   And ask them about the town which stood by the sea; when they exceeded the limits of the Sabbath, when their fish came to them on the day of their Sabbath, appearing on the surface of the water, and on the day on which they did not keep the Sabbath they did not come to them; thus did We try them because they transgressed.
   

2. 18:61 فَلَمَّا بَلَغَا مَجْمَعَ بَيْنِهِمَا نَسِيَا حُوتَهُمَا فَٱتَّخَذَ سَبِيلَهُۥ فِى ٱلْبَحْرِ سَرَبًا

   So when they had reached the junction of the two (rivers) they forgot their fish, and it took its way into the sea, going away.
   

3. 18:63 قَالَ أَرَءَيْتَ إِذْ أَوَيْنَآ إِلَى ٱلصَّخْرَةِ فَإِنِّى نَسِيتُ ٱلْحُوتَ وَمَآ أَنسَىٰنِيهُ إِلَّا ٱلشَّيْطَٰنُ أَنْ أَذْكُرَهُۥ وَٱتَّخَذَ سَبِيلَهُۥ فِى ٱلْبَحْرِ عَجَبًا

   He said: Did you see when we took refuge on the rock then I forgot the fish, and nothing made me forget to speak of it but the Shaitan, and it took its way into the river; what a wonder!
   

4. 37:142 فَٱلْتَقَمَهُ ٱلْحُوتُ وَهُوَ مُلِيمٌ

   So the fish swallowed him while he did that for which he blamed himself
   

5. 68:48 فَٱصْبِرْ لِحُكْمِ رَبِّكَ وَلَا تَكُن كَصَاحِبِ ٱلْحُوتِ إِذْ نَادَىٰ وَهُوَ مَكْظُومٌ

   So wait patiently for the judgment of your Lord, and be not like the companion of the fish, when he cried while he was in distress.