vex vs eat on

vex and eat on both are verbs.

Word	Noun	Adjective	Verb	Adverb
vex	No	No	Yes	No
eat on	No	No	Yes	No

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

vex: disturb the peace of mind of; afflict with mental agitation or distress
eat on: worry or cause anxiety in a persistent way

Other hyponyms of vex include misgive, eat, nag.

vex (verb)	eat on (verb)
be a mystery or bewildering to	worry or cause anxiety in a persistent way
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