All my life I've made up words. It must be some mild form of dyslexia - as I often substitute the wrong word or just plain make one up. Take contentness for instance. Sounds legit, right? Wrong. And the grammar police wouldn't have to make much of a case before arresting me.
But good intention is there.
So here's my argument for the word contentness. It's concise. It gets the point across. And instead of saying: "I have a feeling of complete content," you could say: "I'm full of contentness."
Oh boy, that does sound ridiculous. Somebody arrest me, quick.