blank cheque vs bank check

blank cheque and bank check both are nouns.

Word	Noun	Adjective	Verb	Adverb
blank cheque	Yes	No	No	No
bank check	Yes	No	No	No

As nouns, bank check is a hypernym of blank cheque; that is, bank check is a word with a broader meaning than blank cheque:

blank cheque: a check that has been signed but with the amount payable left blank
bank check: a written order directing a bank to pay money

Other hypernyms of blank cheque include check, cheque.

blank cheque (noun)	bank check (noun)
a check that has been signed but with the amount payable left blank	a written order directing a bank to pay money