is a specific kind of: annoy, bother, chafe, devil, get at, get to, gravel, irritate, nark, nettle, rag, rile, vex.

is a broader term that covers: goad, needle | bedevil, crucify, dun, frustrate, rag, torment | haze.

derivation: harassment, molestation | aggravation, irritation, provocation | plague | bother, fuss, hassle, trouble | harasser, harrier | harasser | firebrand, inciter, instigant, instigator, provoker | provocative.