How is named this kind of powerful words?
I'm talking about of the tiny word "mis" which seems to have the power of changing the means of any other ones

"misunderstanding", "misspellings", "mispronunciations", etc

Can I feel free to use it or is it in reality not very usual?

Question

How is named this kind of powerful words?
I'm talking about of the tiny word "mis" which seems to have the power of changing the means of any other ones

"misunderstanding", "misspellings", "mispronunciations", etc

Can I feel free to use it or is it in reality not very usual?

Answer

CORRECTION:  What are these powerful words called?

Mis- is a prefix meaning wrongly.  It is commonly used. Examples: misjudge, misinterpret, misguided, mismatch, misplace

Answer

I will just add: misunderstand, misread, mishear

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Thank you Daniel!   ... So that's actually a prefix who changes the means of certain words

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Well, "mis" is not a word. It's a prefix. For example, if someone "attempted" to do something and failed, we would not say that they "misattempted" - it's not a word. We would say they failed.