Language /
Slavic languages words similarities with Polish [238]
It is a wery well known fact in linguistics. Polish and Czech belong to the same west slavic group of languages. What was the reason to include them
into the same group ? Do you think it was geography ?
As I've already wrote in one of my posts:
I'm not a professional linguist to do such a statements but in my dilettante opinion division of Slavic lang-s into Western and Eastern is quite vague and conditional. Lexically the Czech is hardly closer to Polish than Russian. Maybe even contra. Use of Latin alphabet, fixed stress pattern (though different between Polish and Czech) and some other small similarities do usually serve as a reason for division. Polish alphabet is not exactly Latin. It uses characters not present in English, for example. Cyrilic alphabet on other hand share some similar characters with Latin. For example: A, B, C, E, H, X, T, O, K, M, P. Ukrainian alphabet does have even "i".
Some distinctive features of the West Slavic languages, as from when they split from the East Slavic and South Slavic branches around the 3rd to 6th centuries AD, are as follows:[3]
development of proto-Slavic tj, dj into palatalized ts, (d)z, as in modern Polish/Czech noc ("night"; compare Russian ночь);
retention of the groups kv, gv as in Polish gwiazda ("star"; compare Russian звезда; but note also Russian цвет vs. Ukrainian квіт, "flower");
retention of tl, dl, as in Polish/Czech radlo/rádlo ("ard"; compare Russian рало);
palatized h (ich-Laut) developed into š, as in Polish musze (locative case of mucha, "fly")
en.wikipedia.org/wiki/West_Slavic_languages
Cropped quote - over 100 words 
