histamine headache vs headache

histamine headache and headache both are nouns.

Word	Noun	Adjective	Verb	Adverb
histamine headache	Yes	No	No	No
headache	Yes	No	No	No

As nouns, headache is a hypernym of histamine headache; that is, headache is a word with a broader meaning than histamine headache:

histamine headache: a painful recurring headache associated with the release of histamine from cells
headache: pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs

Other hypernyms of histamine headache include cephalalgia, head ache.

histamine headache (noun)	headache (noun)
a painful recurring headache associated with the release of histamine from cells	something or someone that causes anxiety; a source of unhappiness
	pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs