scare vs fearfulness

scare and fearfulness both are nouns.

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

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

scare: a sudden attack of fear
fearfulness: an emotion experienced in anticipation of some specific pain or danger (usually accompanied by a desire to flee or fight)

Other hypernyms of scare include fear, fright.

scare (noun)	fearfulness (noun)
a sudden attack of fear	the trait of being afraid
sudden mass fear and anxiety over anticipated events	an emotion experienced in anticipation of some specific pain or danger (usually accompanied by a desire to flee or fight)

scare (verb)	fearfulness (verb)
cause fear in
cause to lose courage; to be daunted; to be scared away