directorate vs board of directors

directorate and board of directors both are nouns.

Word	Noun	Adjective	Verb	Adverb
directorate	Yes	No	No	No
board of directors	Yes	No	No	No

As nouns, directorate and board of directors are synonyms defined as:

directorate and board of directors: a group of persons chosen to govern the affairs of a corporation or other large institution

directorate (noun)	board of directors (noun)
a group of persons chosen to govern the affairs of a corporation or other large institution	a group of persons chosen to govern the affairs of a corporation or other large institution