megrim vs hemicrania

megrim and hemicrania both are nouns.

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

As nouns, megrim and hemicrania are synonyms defined as:

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

Other synonyms of megrim include migraine, sick headache.

megrim (noun)	hemicrania (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