line of credit vs bank line

line of credit and bank line both are nouns.

Word	Noun	Adjective	Verb	Adverb
line of credit	Yes	No	No	No
bank line	Yes	No	No	No

As nouns, line of credit and bank line are synonyms defined as:

line of credit and bank line: the maximum credit that a customer is allowed

Other synonyms of line of credit include credit line, line, personal credit line, personal line of credit.

line of credit (noun)	bank line (noun)
the maximum credit that a customer is allowed	the maximum credit that a customer is allowed