hemicrania vs migraine

hemicrania and migraine both are nouns.

Word	Noun	Adjective	Verb	Adverb
hemicrania	Yes	No	No	No
migraine	Yes	No	No	No

As nouns, hemicrania and migraine are synonyms defined as:

hemicrania and migraine: a severe recurring vascular headache; occurs more frequently in women than men

Other synonyms of hemicrania include megrim, sick headache.

hemicrania (noun)	migraine (noun)
a severe recurring vascular headache; occurs more frequently in women than men	a severe recurring vascular headache; occurs more frequently in women than men