Where does the error Typo: In Word 'word' come from?

Question

PyCharm

I use the PyCharm editor for Python, sometimes the words in the comments are underlined with a wavy line, sometimes the same happens with the names of the functions that I set. The words are absolutely harmless and written without errors. For example, I start a comment with the word if , he immediately underlines it. Is that what he doesn't like?
I read that you can add a word to the dictionary and the error will disappear, or turn off the spell check completely, but I'm interested in the very root reason why he underlines harmless words.

Answer 1

It works just like in Word, regular spell check or something else, you don't have to pay so much attention to it.

Answer 2

For "Typo: In word..." errors for Russian words:
Via File -> Settings... -> Editor -> Natural Languages ​​add Russian language
For "Typo: In word..." errors for English words:
Write exactly English words and use "_" as a separator.

Answer 3

Written by Typo )) So it's just in his opinion Stupidly

Answer 4

Plus, the problem is not solved