card index vs filing cabinet

card index and filing cabinet both are nouns.

Word	Noun	Adjective	Verb	Adverb
card index	Yes	No	No	No
filing cabinet	Yes	No	No	No

As nouns, filing cabinet is a hypernym of card index; that is, filing cabinet is a word with a broader meaning than card index:

card index: an alphabetical listing of items (e.g., books in a library) with a separate card for each item
filing cabinet: office furniture consisting of a container for keeping papers in order

Other hypernyms of card index include file, file cabinet.

card index (noun)	filing cabinet (noun)
an alphabetical listing of items (e.g., books in a library) with a separate card for each item	office furniture consisting of a container for keeping papers in order