smart card vs open-end credit

smart card and open-end credit both are nouns.

Word	Noun	Adjective	Verb	Adverb
smart card	Yes	No	No	No
open-end credit	Yes	No	No	No

As nouns, open-end credit is a hypernym of smart card; that is, open-end credit is a word with a broader meaning than smart card:

smart card: a plastic card containing a microprocessor that enables the holder to perform operations requiring data that is stored in the microprocessor; typically used to perform financial transactions
open-end credit: a consumer credit line that can be used up to a certain limit or paid down at any time

Other hypernyms of smart card include positive identification, charge account credit, revolving credit.

smart card (noun)	open-end credit (noun)
a plastic card containing a microprocessor that enables the holder to perform operations requiring data that is stored in the microprocessor; typically used to perform financial transactions	a consumer credit line that can be used up to a certain limit or paid down at any time