The word hidden is not ordinarily a noun, but an adjective, the past participle of to hide. Something or someone hidden could be referred as "the hidden" where it would be a concrete noun.
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
No, the word 'hidden' is the past participle of the verbto hide. The past participle of the verb also functions as an adjective.Examples:The spare key is hidden under one of the flowerpots. (verb)There was a hidden message in the journal. (adjective)The abstract noun form of the verb to hide is the gerund, hiding, a word for a concept.
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.
The abstract noun for the adjective quick is quickness.