ف ل کf-l-k
(ن) فَلَكَ يَفْلُكُ فَلْكًاfalaka yafluku falkan: for a thing to be rounded like an egg, oval. (This verb is not used in the Quran.)
فُلْكٌfulk (noun, ism dhāt): ship (because it is oval in shape); it is used for both singular and plural. ﴿وَالْفُلْكِ الَّتِيْ تَجْرِيْ فِي الْبَحْرِ﴾ (Al-Baqarah 2:164); ﴿فِي الْفُلْكِ الْمَشْحُوْنِ﴾ (Yā Sīn 36:41)
فَلَكٌfalak (noun, ism dhāt): the fixed course along which the planets revolve, orbit. ﴿وَكُلٌّ فِيْ فَلَكٍ يَّسْبَحُوْنَ﴾ (Yā Sīn 36:40)