casebook vs written record

casebook and written record both are nouns.

Word	Noun	Adjective	Verb	Adverb
casebook	Yes	Yes	No	No
written record	Yes	No	No	No

As nouns, written record is a hypernym of casebook; that is, written record is a word with a broader meaning than casebook:

casebook: a book in which detailed written records of a case are kept and which are a source of information for subsequent work
written record: a written document preserving knowledge of facts or events

Other hypernyms of casebook include written account.

casebook (noun)	written record (noun)
a book in which detailed written records of a case are kept and which are a source of information for subsequent work	a written document preserving knowledge of facts or events

casebook (adjective)	written record (adjective)
according to or characteristic of a casebook or textbook; typical