hemicrania vs megrim

hemicrania and megrim both are nouns.

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

As nouns, hemicrania and megrim are synonyms defined as:

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

Other synonyms of hemicrania include migraine, sick headache.

hemicrania (noun)	megrim (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