proportional font vs font

proportional font and font both are nouns.

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

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

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

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

proportional font (noun)	font (noun)
any font whose different characters have different widths	bowl for baptismal water
	a specific size and style of type within a type family