repulse vs sicken

repulse is a noun but sicken is not a noun.

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

As verbs, sicken is a hyponym of repulse; that is, sicken is a word with a more specific, narrower meaning than repulse:

Other hyponyms of repulse include churn up, disgust, nauseate, revolt, put off, turn off.

repulse (noun)	sicken (noun)
an instance of driving away or warding off

repulse (verb)	sicken (verb)
force or drive back	get sick
cause to move back by force or influence	make sick or ill
be repellent to; cause aversion in	cause aversion in; offend the moral sense of
	upset and make nauseated