No, they're totally different animals. Polish 'rak' is English "crawfish', I believe. But indeed the zodiac sign Cancer is 'Rak' (I didn't even know that the constellation looks like a crab), and so is cancer the disease.
More commonly known as crayfish, but Wiki says AKA crawfish. I can't believe cancer the disease has the same word as cancer the constellation in Polish though, I thought it was a coincidence in English
So what is the difference between od(e) and niż? I'm assuming od vs. ode has to do with phonology, like w vs. we. But od(e) and niż both seem to connect two parts of a comparison, are they interchangeable? Or if not, how does it work?