Question

change common noun into abstract

Answer 1

Brotherhood, darkness, adulthood, gambling, older.

Answer 2

An abstract noun is a word for something that can't be experienced by any of the five senses; it can't be seen, heard, smelled, tasted, or touched.
Brother - Brotherhood
Tyrant - Tyranny
Dark - Darkness
Adult - Adultness
Gambler - Gamble
Old - Old
Hope I am able to help you....
Shreya