Which term describes a word that adds specificity to a subject in language?

The term that best describes a word that adds specificity to a subject is vocabulary. Vocabulary refers to the range of words that a person uses or knows. It encompasses words that can provide detailed and precise meaning to a subject, enhancing communication and understanding. By using specific vocabulary, a speaker or writer can convey thoughts more clearly and accurately.

For example, using precise nouns instead of general terms can create a vivid picture for the reader, making the writing more engaging and informative. This is essential in effective communication, as it allows for nuance and detail that enrich the language.