Yes, the noun 'hierarchy' is an abstract noun; a word for a series in which each element is graded or ranked; a categorization of a group of people according to ability or status; a group of persons having authority, etc.
It is a hierarchy the way the run the school
The word omen is an abstract noun.
abstract
The word 'ugliness' is an abstract noun; a word for an opinion, a word for a concept.
The word 'truth' is an abstract noun, a word for a concept.
Well I don't think there is such thing but I've heard it could be simalar to Abstract- Abstract is Numbers, Letters and shapes.
It is a hierarchy the way the run the school
arrange
Yes, the word 'fun' is an abstract noun, a word for a concept.
The word 'independence' is an abstract noun, a word for a concept.
The word omen is an abstract noun.
The king has a hierarchy over his subjects. Happy now?
popularity
abstract
Abstract
The noun 'hopefulness' is an abstract noun, a word for an emotion.
The word 'arrogance' is an abstract noun, a word for an attitude or behavior; a word for a concept.