Got the quest from the greybeards and when i recieved the word, the quest marker didn't disappear and the quest is still active. I've seen a lot of people experiencing the same thing, and I obviously cannot use console commands, and the other way was to get another word of power, but i had already gotten it previously. Any help would be greatly appreciated.

There is no fix for that little bug.

But it's a minor annoyance that doesn't prevent you from getting other words.