Using a hyphen in compound nouns or compound adjectives primarily serves the following purposes:
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Eliminating Ambiguity: Hyphens can clarify meaning by indicating how words are related to each other. For example, “small-business owner” clarifies that the owner runs a small business, whereas “small business owner” without the hyphen could be misread as an owner who is small in size.
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Determining Relationship: In some cases, using a hyphen helps the reader understand the relationship between the words involved, although stating that it tells you where to add "and" might be a bit misleading. The hyphen shows that the words are working together as a single idea or descriptor.
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Enhancing Readability: While it's not strictly about pausing, hyphens can help in understanding complex phrases by visually separating ideas, which can assist in the flow of reading.
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Aesthetic Appeal: While "looking cute" may be a subjective viewpoint, some people appreciate the clarity and style that a hyphen can bring to their writing.
Overall, the primary and most important reason to use hyphens is to eliminate ambiguity and aid in clarity and understanding.