vex vs roil

vex and roil both are verbs.

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

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

Other hyponyms of vex include beat, scramble, toss, rile, poke.

vex (verb)	roil (verb)
be a mystery or bewildering to	make turbid by stirring up the sediments of
subject to prolonged examination, discussion, or deliberation	be agitated
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