double-entry bookkeeping vs double entry

double-entry bookkeeping and double entry both are nouns.

Word	Noun	Adjective	Verb	Adverb
double-entry bookkeeping	Yes	No	No	No
double entry	Yes	No	No	No

As nouns, double-entry bookkeeping and double entry are synonyms defined as:

double-entry bookkeeping and double entry: bookkeeper debits the transaction to one account and credits it to another

double-entry bookkeeping (noun)	double entry (noun)
bookkeeper debits the transaction to one account and credits it to another	bookkeeper debits the transaction to one account and credits it to another