fixed-width font vs constant-width font

fixed-width font and constant-width font both are nouns.

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

As nouns, fixed-width font and constant-width font are synonyms defined as:

fixed-width font and constant-width font: a typeface is which each character is given the same width (as by a typewriter)

Other synonyms of fixed-width font include monospaced font, typewriter font.

fixed-width font (noun)	constant-width font (noun)
a typeface is which each character is given the same width (as by a typewriter)	a typeface is which each character is given the same width (as by a typewriter)