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Modern Polish spelling is problematic for many Polish speakers - all these sz, cz, rz could be easily replaced by š, č, ř (as in Czech in Slovak) but we stick to these awkward digraphs for some reason.
The word "ścierwo" has double meaning in Polish, one for "corpse", the other a popular insult - I guess it's the same in Ukrainian (стерва) and Russian. "-jad" (-ед) is obviously a noun made from verb jeść (eat).