haemorrhagic stroke vs apoplexy

haemorrhagic stroke and apoplexy both are nouns.

Word	Noun	Adjective	Verb	Adverb
haemorrhagic stroke	Yes	No	No	No
apoplexy	Yes	No	No	No

As nouns, apoplexy is a hypernym of haemorrhagic stroke; that is, apoplexy is a word with a broader meaning than haemorrhagic stroke:

haemorrhagic stroke: stroke caused by the rupture of a blood vessel in the brain
apoplexy: a sudden loss of consciousness resulting when the rupture or occlusion of a blood vessel leads to oxygen lack in the brain

Other hypernyms of haemorrhagic stroke include cerebrovascular accident, CVA, stroke, bleeding, haemorrhage, hemorrhage.

haemorrhagic stroke (noun)	apoplexy (noun)
stroke caused by the rupture of a blood vessel in the brain	a sudden loss of consciousness resulting when the rupture or occlusion of a blood vessel leads to oxygen lack in the brain