turn one's stomach vs sicken

turn one's stomach and sicken both are verbs.

Word	Noun	Adjective	Verb	Adverb
turn one's stomach	No	No	Yes	No
sicken	No	No	Yes	No

As verbs, turn one's stomach and sicken are synonyms defined as:

Other synonyms of turn one's stomach include nauseate.

turn one's stomach (verb)	sicken (verb)
upset and make nauseated	get sick
	make sick or ill
	cause aversion in; offend the moral sense of
	upset and make nauseated