Guess The Word

The one I did is the longest word in the English language meeting the criteria of 1. Not a technical term (thus excluding titin), and 2. Was not created for the purpose of being the longest word.
I am not that smart. lol. I am only 10 years old! What do u mean by that in simpler terms
It's the longest regular English word.
Um, new word: P_ _ _ _ _ _ _
Also, I was going to do the worlds longest word, but then I found out it has 189,819 letters!
Promised
Proteins
Protests