roil vs vex

roil and vex both are verbs.

Word	Noun	Adjective	Verb	Adverb
roil	No	No	Yes	No
vex	No	No	Yes	No

As verbs, vex is a hypernym of roil; that is, vex is a word with a broader meaning than roil:

Other hypernyms of roil include agitate, commove, disturb, raise up, shake up, stir up.

roil (verb)	vex (verb)
make turbid by stirring up the sediments of	be a mystery or bewildering to
be agitated	subject to prolonged examination, discussion, or deliberation
	change the arrangement or position of
	cause annoyance in; disturb, especially by minor irritations
	disturb the peace of mind of; afflict with mental agitation or distress