Ignore one “misspelling” in Vim

Without having the word stored somewhere, it’s hard (not to say impossible) to ignore it always.

But, if you are looking to ignore the word really once, that is only for a moment, you can add it to the internal list with the zG command.

                                                             *zG*
zG              Like "zg" but add the word to the internal word list
                |internal-wordlist|.


                                               *internal-wordlist*
The internal word list is used for all buffers where 'spell' is set.  It is
not stored, it is lost when you exit Vim.  It is also cleared when 'encoding'
is set.