dismay vs appall

dismay is a noun but appall is not a noun.

Word	Noun	Adjective	Verb	Adverb
dismay	Yes	No	Yes	No
appall	No	No	Yes	No

As verbs, dismay and appall are synonyms defined as:

dismay and appall: fill with apprehension or alarm; cause to be unpleasantly surprised

Other synonyms of dismay include alarm, appal, horrify.

dismay (noun)	appall (noun)
fear resulting from the awareness of danger
the feeling of despair in the face of obstacles

dismay (verb)	appall (verb)
fill with apprehension or alarm; cause to be unpleasantly surprised	strike with disgust or revulsion
lower someone's spirits; make downhearted	fill with apprehension or alarm; cause to be unpleasantly surprised