font cartridge vs fount

font cartridge and fount both are nouns.

Word	Noun	Adjective	Verb	Adverb
font cartridge	Yes	No	No	No
fount	Yes	No	No	No

As nouns, fount is a hypernym of font cartridge; that is, fount is a word with a broader meaning than font cartridge:

font cartridge: any font that is contained in a cartridge that can be plugged into a computer printer
fount: a specific size and style of type within a type family

Other hypernyms of font cartridge include case, face, font, typeface.

font cartridge (noun)	fount (noun)
any font that is contained in a cartridge that can be plugged into a computer printer	a plumbing fixture that provides a flow of water
	a specific size and style of type within a type family