bold vs font

bold and font both are nouns.

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

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

Other hypernyms of bold include case, face, fount, typeface.

bold (noun)	font (noun)
a typeface with thick heavy lines	bowl for baptismal water
	a specific size and style of type within a type family

bold (adjective)	font (adjective)
fearless and daring
clear and distinct
very steep; having a prominent and almost vertical front