anxiousness vs scare

anxiousness and scare both are nouns.

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

As nouns, scare is a hyponym of anxiousness; that is, scare is a word with a more specific, narrower meaning than anxiousness:

anxiousness: (psychiatry) a relatively permanent state of worry and nervousness occurring in a variety of mental disorders, usually accompanied by compulsive behavior or attacks of panic
scare: sudden mass fear and anxiety over anticipated events

Other hyponyms of anxiousness include castration anxiety, hypochondria, hypochondriasis, overanxiety, panic, social anxiety.

anxiousness (noun)	scare (noun)
a feeling of mild anxiety about possible developments	a sudden attack of fear
(psychiatry) a relatively permanent state of worry and nervousness occurring in a variety of mental disorders, usually accompanied by compulsive behavior or attacks of panic	sudden mass fear and anxiety over anticipated events

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