Abstract nouns are things that can't be experienced by the physical senses; they can't seen, heard, smelled, tasted, or touched; they are things that can only be known, understood, learned, believed, or felt emotionally.
There are some nouns that can be used as both an abstract or a concrete noun:
abstract: I don't get the point of that joke.
concrete: I've broken the point on my pencil.
abstract: We're going to visit Maggie to lift her spirits.
concrete: I have some spirits of camphor for that congestion.
abstract: I have the eight to midnight watch.
concrete: I received a new watch for my birthday.
abstract: I'm going to be a famous movie star.
concrete: That star near the horizon is the planet Venus.
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Comprehensiveness is the abstract noun for the adjective comprehensive. Another abstract noun form is comprehension.
Disobedience is the abstract noun form.
The abstract noun form is gluttony.
Yes, the noun 'falsehood' is an abstract noun, a word for a concept.
Yes, the noun 'introduction' is an abstract noun, a word for a concept.