evening bag vs pocketbook

evening bag and pocketbook both are nouns.

Word	Noun	Adjective	Verb	Adverb
evening bag	Yes	No	No	No
pocketbook	Yes	No	No	No

As nouns, pocketbook is a hypernym of evening bag; that is, pocketbook is a word with a broader meaning than evening bag:

evening bag: a handbag used with evening wear
pocketbook: a container used for carrying money and small personal items or accessories (especially by women)

Other hypernyms of evening bag include bag, handbag, purse.

evening bag (noun)	pocketbook (noun)
a handbag used with evening wear	a container used for carrying money and small personal items or accessories (especially by women)
	pocket-sized paperback book
	a pocket-size case for holding papers and paper money
	your personal financial means