س ر بs-r-b
(ن) سَرَبَ يَسْرُبُ سُرُوْبًاsaraba yasrubu surūban: (of water) to flow; to go on penetrating.
(س) سَرِبَ يَسْرَبُ سَرَبًاsariba yasrabu saraban: (of water) to flow out of a vessel; to run down into low ground; سَرَبٌsarab: a passage made through the earth or the water; a tunnel. ﴿فَاتَّخَذَ سَبِيْلَهُۥ فِي الْبَحْرِ سَرَبًا﴾ (Al-Kahf 18:61)
سَارِبٌsārib (active participle, ism fāʿil): flowing; going about. ﴿وَسَارِبٌۢ بِالنَّهَارِ﴾ (Ar-Raʿd 13:10)
سَرَابٌsarāb (noun, ism dhāt): sand that looks like flowing water; a mirage; a deception, a delusion. ﴿كَسَرَابٍۢ بِقِيْعَةٍ﴾ (An-Nūr 24:39)