day book vs written record

day book and written record both are nouns.

Word	Noun	Adjective	Verb	Adverb
day book	Yes	No	No	No
written record	Yes	No	No	No

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

day book: the daily written record of events (as arrests) in a police station
written record: a written document preserving knowledge of facts or events

Other hypernyms of day book include written account.

day book (noun)	written record (noun)
the daily written record of events (as arrests) in a police station	a written document preserving knowledge of facts or events