fixed-width font vs font

fixed-width font and font both are nouns.

Word	Noun	Adjective	Verb	Adverb
fixed-width font	Yes	No	No	No
font	Yes	No	No	No

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

fixed-width font: a typeface is which each character is given the same width (as by a typewriter)
font: a specific size and style of type within a type family

Other hypernyms of fixed-width font include case, face, fount, typeface.

fixed-width font (noun)	font (noun)
a typeface is which each character is given the same width (as by a typewriter)	bowl for baptismal water
	a specific size and style of type within a type family