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Noun headache has 2 senses
- 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:
- 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: