vex vs eat into

vex and eat into both are verbs.

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

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

vex (verb)	eat into (verb)
be a mystery or bewildering to	gnaw into; make resentful or angry
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