Cloud

mrak

(visible mass of water droplets suspended in the air)

mrak

(mass of dust, steam or smoke)

mrak

(anything which makes things foggy or gloomy)

oblak

(visible mass of water droplets suspended in the air)

oblak

(mass of dust, steam or smoke)

zatemnit

(to make obscure (e.g. to cloud the issue))

zatemnit se

(to become foggy or gloomy, to become obscured from sight)