fearfulness vs afraid

fearfulness is a noun but afraid is not a noun.

Word	Noun	Adjective	Verb	Adverb
fearfulness	Yes	No	No	No
afraid	No	Yes	No	No

fearfulness (noun)	afraid (noun)
the trait of being afraid
an emotion experienced in anticipation of some specific pain or danger (usually accompanied by a desire to flee or fight)

fearfulness (adjective)	afraid (adjective)
	filled with fear or apprehension
	filled with regret or concern; used often to soften an unpleasant statement
	having feelings of aversion or unwillingness
	feeling worry or concern or insecurity