In Gvim there is an option upon rightclicking a highlighted word to ignore all such words. What is the shortcut for that?
Use zG. From
*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.