bold face vs bold

bold face and bold both are nouns.

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

As nouns, bold face and bold are synonyms defined as:

Other synonyms of bold face include boldface.

bold face (noun)	bold (noun)
a typeface with thick heavy lines	a typeface with thick heavy lines

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