I think I have known this word before, but it has completely slipped my mind. It will be a bit hard to tell you what word I'm talking about, but I will try as good as I can.
Consider these sentences
I'm your older brother, it is obvious that I will kick your ass.
Now, the sentence I want to use doesn't use an adjective where obvious is placed. It uses a noun.
I'm your older brother, it is a/an (...) that I will kick your ass.
I'm going to give an example of this with words that I know exist.
I'm your older brother, it is inevitable that I will kick your ass.
But the sentence I want is-
I'm your older brother, it is an inevitability that I will kick your ass.
So, I want the noun, not the adjective. I don't think there is a noun form of obvious, though I don't need that either. I just need a noun that fits my description.
Hopefully this wasn't too complicated, but I often struggle to illustrate what I'm talking about when it comes these kinds of questions.