appal vs sicken

appal and sicken both are verbs.

Word	Noun	Adjective	Verb	Adverb
appal	No	No	Yes	No
sicken	No	No	Yes	No

As verbs, sicken is a hypernym of appal; that is, sicken is a word with a broader meaning than appal:

Other hypernyms of appal include churn up, disgust, nauseate, revolt.

appal (verb)	sicken (verb)
strike with disgust or revulsion	get sick
fill with apprehension or alarm; cause to be unpleasantly surprised	make sick or ill
	cause aversion in; offend the moral sense of
	upset and make nauseated