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Noun headache has 2 senses
  1. concern, worry, headache, vexation - something or someone that causes anxiety; a source of unhappiness; "New York traffic is a constant concern"; "it's a major worry"
    --1 is a kind of negative stimulus
    --1 has particulars:
     bugaboo; burden, load, encumbrance, incumbrance, onus; business
  2. headache, head ache, cephalalgia - pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs
    --2 is a kind of ache, aching
    --2 has particulars:
     histamine headache, cluster headache; migraine, megrim, sick headache, hemicrania; sick headache; sinus headache; tension headache
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