(ن) كَنَّ يَكُنُّ كَنًّاkanna yakunnu kannan (original form: كَنَنَ يَكْنُنُkanana yaknunu): to hide something inside something, to cover, to keep safe (this verb is not used in the Quran).
مَكْنُوْنٌmaknūn (passive participle, ism mafʿūl): hidden and kept safe. ﴿كَاَنَّهُنَّ بَيْضٌ مَّكْنُوْنٌ﴾ (Aṣ-Ṣāffāt 37:49); ﴿فِيْ كِتٰبٍ مَّكْنُوْنٍ﴾ (Al-Wāqiʿah 56:78)
كِنَانٌkinān pl. اَكِنَّةٌakinnah (noun, ism dhāt): a thing in which something is hidden, a cover, a veil. ﴿وَجَعَلْنَا عَلٰى قُلُوْبِهِمْ اَكِنَّةً﴾ (Al-Anʿām 6:25)
كِنٌّkinn pl. اَكْنَانٌaknān (noun, ism dhāt): a place in which a person takes shelter, a cave, a refuge. ﴿وَجَعَلَ لَكُمْ مِّنَ الْجِبَالِ اَكْنَانًا﴾ (An-Naḥl 16:81)
Form IV (ifʿāl) اَكَنَّ يُكِنُّ اِكْنَانًاakanna yukinnu iknānan: to keep (a matter) hidden in the heart. ﴿اَوْ اَكْنَنْتُمْ فِيْٓ اَنْفُسِكُمْ﴾ (Al-Baqarah 2:235)