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There are concrete (like tree, dog) and abstract concepts (like war, love etc.). I see that concept is expressed as a noun, but what about other parts of speech (verbs, adjectives, etc.)? Are they abstract concept or they became a concept when are changed to noun ?
Samples:
Are these 4 words above concepts or only those which are noun ?
Abstract vs concrete or figurative vs literal is a function of a word and its context, not of a dictionary entry lemma, a surface form or string literal like tree or dog.
For example, if we point to a tree in front of us and say "This tree grows all over the world", we do not literally mean this concrete tree.
There are also many tree concepts in mathematics and computer science, as well as books and other works by the name.
Conversely, we can say "His love smashed his car in an act of revenge" and then love is rather concrete.
So if we cannot without context say that a noun like tree is concrete or abstract, we cannot without context say that a verb or adjective like to know or black is concrete or abstract.
