The form of "old" that would be considered an abstract noun would be "oldness", the state of being old.
Abstract
The noun 'antique' is an abstract noun; a word for something that has special value because it is old, rare, beautiful, or unique. The noun 'antique' is a word for a concept.The abstract noun form for the adjective antique is antiqueness.
Yes, the noun astonishment is an abstract noun, a word for an emotional reaction.
Is undergone an abstract noun
Concrete noun
The abstract noun is criticism.
The noun 'hopefulness' is an abstract noun, a word for an emotion.
The abstract noun is obligation.
Abstract noun of hopeless
Friendship has not abstract noun because It is a abstract noun
The abstract noun form is tourism.
The abstract noun for the adjective vacant is vacantness. Another abstract noun form is vacancy.