journal vs account book

journal and account book both are nouns.

Word	Noun	Adjective	Verb	Adverb
journal	Yes	No	No	No
account book	Yes	No	No	No

As nouns, account book is a hypernym of journal; that is, account book is a word with a broader meaning than journal:

Other hypernyms of journal include book, book of account, ledger, leger.

journal (noun)	account book (noun)
the part of the axle contained by a bearing	a record in which commercial accounts are recorded
a record book as a physical object
a periodical dedicated to a particular subject
a daily written record of (usually personal) experiences and observations
a ledger in which transactions have been recorded as they occurred