It's the same West Slavic language group along with Slovak, thus those are similar to the certain degree but sometimes differ way too much like for example, inf

It's the same West Slavic language group along with Slovak, thus those are similar to the certain degree but sometimes differ way too much like for example, infamous "szukać" (look for, seek; hledat) and "šukat" (to have sexual intercourse, to put it mildly) or "czerstwy" (stale) and "čerstvy" (fresh). I'm partially able to understand my Czech friend when he does speak in his language and same goes for him. As for "mama", there's a quite good explanation why it does looks similar (if not same) in many languages: https://www.mother.ly/parenting/mama-is-most-universal-word https://www.mother.ly/parenting/mama-is-most-universal-word