sicken vs turn one's stomach

sicken and turn one's stomach both are verbs.

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

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

Other synonyms of sicken include nauseate.

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