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Heading and Headline

A headline is the title of an article like a news paper or magazine. Heading can be the same thing or describe a direction you are headed in. Headlines are the big words at the top of a newspaper. A heading is the big words at the top of a section in a book or written document other than a newspaper.(ByReddit)
A headline is at the beginning of an article, and oftentimes is a (one-line) summary of the whole article. On the other hand, a heading is for a section of the article.(StackExchange)