proportional font vs fount

proportional font and fount both are nouns.

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

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

proportional font: any font whose different characters have different widths
fount: a specific size and style of type within a type family

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

proportional font (noun)	fount (noun)
any font whose different characters have different widths	a plumbing fixture that provides a flow of water
	a specific size and style of type within a type family