The noun 'grief' is an abstract noun, a word for an emotion.
A noun functions as the subject of a sentence or a clause, and as the object of a verb or a preposition.
Example sentences:
The grief over the loss took her some time to overcome. (subject of the sentence)
The sadness that her grief brought could be seen on her face. (subject of the clause)
The news brought grief to her family. (direct object of the verb 'brought')
It took some time for the grief to pass. (object of the preposition 'for')
The nouns in the sentence, people and hall, are both concrete nouns. There are no abstract nouns in the sentence. The use of the word 'protest' is the trick. As a noun, protest is an abstract noun, but in your sentence it is the verb form 'to protest', not a noun.
The abstract noun 'kind' functions as a subject of a sentence or clause, and as the object of a verb or a preposition.Examples:The kind I like are the lilacs. (subject of the sentence)These are not as good as the homemade kind. (object of the preposition 'as')
An adjective is a word that describes a noun or a verb. An example of a sentence that uses the word "abstract" in a sentence as an adjective would be: It is difficult for children to fully comprehend many abstract ideas.
I am filling with grief. Grief is all I feel. We were in deep grief.
The abstract noun 'wisdom' will function as the subject of a sentence or a clause, and as the object of a verb or a preposition. Examples: Wisdom is a gift the many people don't use. (subject of the sentence) It takes a lifetime to develop wisdom. (object of the verb 'develop')
You would use the word "astrophysics" in a sentence in the role of an abstract noun. For example, "Astrophysics is the study of the physics of the universe."
The noun 'modesty' is an abstract noun as a word for the quality or state of being unassuming or moderate in character. A noun functions as the subject of a sentence or a clause, and as the object of a verb or a preposition. EXAMPLES Modesty is considered an admirable quality. (subject of the sentence) She was admired for her modesty. (object of the preposition 'for')
Hospitality is a critical asset in hotel business.
Good grief Charlie Brown!
The noun 'save' is a sports term, a singular, common, abstract noun; a word for a play that prevents an opponent from scoring or winning.
The concrete nouns are memorial and monuments.The abstract noun is setting.The noun memorial can be an abstract or a concrete noun. In this sentence it seems to be referring to a physical object (not far from two other monuments). I interpret this use as the memorial being something physical, an object in a place.
The noun possible is a singular, common, abstract noun; a word for the potential of someone or something to become or do something. Example sentence: Let's attempt the possible and not worry about the impossible.