Yes, the noun 'comfort is a common noun; a general word for a state of physical ease and freedom from pain or constraint.
The word comfort is also a verb: comfort, comforts, comforting, comforted.
Examples:
noun: Our guests' comfort is our priority.
verb: Some nice hot tea will comfort them.
Yes, the noun astonishment is an abstract noun, a word for an emotional reaction.
Is undergone an abstract noun
The abstract noun is criticism.
The abstract noun is obligation.
Abstract noun of hopeless
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.