its a Roman nickname, but agnomen works.
epithet
Perhaps penname? Hope this helps.
The word Mollusk is a 7 letter word.
Wart
Ike
Wart
ron
The 7 letter word is "Capsule"
God is not your home-boy. There is no nickname for Him. Plus, I don't know why you want a nickname. I mean 'God' is a three letter word!
Ability is a 7 letter word.
A 7-letter word for barely boiled is "poached".
pontoon
Can't get a 7 letter word with only 6 letters. The 6 letter word is DESIST.