The noun (gerund) 'plunging' is an abstract noun as a word for an act of entering upon a course of action that involves some risk.
The noun 'plunging' is a concrete noun as a word for a leap or a dive; a word for a physical act.
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.
Abstract noun of hopeless
The abstract noun is obligation.
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.
The noun childhood is a singular, common, abstract, compound noun; a word for the time of being a child.
The abstract noun for the adjective quick is quickness.