Question

what are the words given on the top of a dictionary' page called page​

Answer 1

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These are called head words or guide words.

Explanation :

The guide words are usually that first and last main entries on the page, but there are exceptions. Actually, the guide words are the first and last entries alphabetically on the page, and this includes all the boldface entries, not just the main entries

Hope this could help you..!

Answer 2

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Headword, guide word. a word printed at the top of a page in a dictionary or other reference book to indicate the first or last entry or article on that page.