Brad and Caroline are the concrete nouns in the sentence.
A noun is a word that typically serves as the name of a particular thing or thing group, such as a living thing, a place, an action, a quality, a state of existence, or an idea.
The definition of lexical categories (speech parts) is based on how their constituents mix with other expression types. In different languages, there are different noun-syntactic rules. Nouns are words that can be the head of a noun phrase in English and can appear with articles and attributive adjectives. As far as we are aware, every language has a division in grammar that resembles a noun-verb distinction.
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