Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun diary

2 senses of diary

Sense 1
diary, journal -- (a daily written record of (usually personal) experiences and observations)
       => writing, written material, piece of writing -- (the work of a writer; anything expressed in letters of the alphabet (especially when considered from the point of view of style and effect); "the writing in her novels is excellent"; "that editorial was a fine piece of writing")

Sense 2
diary -- (a personal journal (as a physical object))
       => journal -- (a record book as a physical object)