chequebook vs blank check

chequebook and blank check both are nouns.

Word	Noun	Adjective	Verb	Adverb
chequebook	Yes	No	No	No
blank check	Yes	No	No	No

chequebook (noun)	blank check (noun)
a book issued to holders of checking accounts	a check that has been signed but with the amount payable left blank
	freedom to do as you see fit