apprehensiveness vs fearfulness

apprehensiveness and fearfulness both are nouns.

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

As nouns, fearfulness is a hypernym of apprehensiveness; that is, fearfulness is a word with a broader meaning than apprehensiveness:

apprehensiveness: fearful expectation or anticipation
fearfulness: an emotion experienced in anticipation of some specific pain or danger (usually accompanied by a desire to flee or fight)

Other hypernyms of apprehensiveness include fear, fright.

apprehensiveness (noun)	fearfulness (noun)
fearful expectation or anticipation	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)