Head ache and Migraine

Head ache noun - Pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs.

Migraine and head ache are semantically related. In some cases you can use "Migraine" instead a noun phrase "Head ache".

Migraine noun - A severe, recurring vascular headache; occurs more frequently in women than men.

Head ache and migraine are semantically related. Sometimes you can use "Head ache" instead a noun "Migraine".