The second tree assumes the DP hypothesis, namely that determiners rather than nouns serve as phrase heads.
There have been offered several examples of English-language nouns which do not have any reference: drought, enjoyment, finesse, behalf as found in on behalf of , dint in dint of , and sake for the sake of.
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Abstract nouns that refer to events are almost usually countable: a noise; a meeting.
For example: Notice that in reality there's no grammatical difference between concrete and abstract nouns.
Abstract nouns like "hopes" and "dreams" are countable.