leger vs book of account

leger and book of account both are nouns.

Word	Noun	Adjective	Verb	Adverb
leger	Yes	No	No	No
book of account	Yes	No	No	No

As nouns, leger and book of account are synonyms defined as:

leger and book of account: a record in which commercial accounts are recorded

Other synonyms of leger include account book, book, ledger.

leger (noun)	book of account (noun)
a record in which commercial accounts are recorded	a record in which commercial accounts are recorded