How about the word for fire?
Vatra

Water
Voda

Wind
Vjetar

The original and one of our first European words was water. And thanks to the English language it is preserved in its original word as it once was "water".
we like the English like to simplify things so we short them or change a letter to make it easier to pronounce.
But what the key to this is is that in all those words you have the letters Tar. Which we all know stands for Earth or terra-Tarra...so in wind-vjetar (vje) read it like vie I like india e like echo v like Victor. That is the word for Wieving I'm not spelling it right but you know what I mean when it goes up and down...so that's the vie in vjetar
Water is the same
Vazduh iz air. When you're blowing air you are making the duh sound.Not dah...Duuuh.
Zrak is also air or more precise a ray
Zrak(rak-ray)
Grave-Grob
From the act of Grabiti(to grab)
German is even said grab for grave. Play it all has to do with digging the Earth. A predator is called a grabljivac(because he grabs)