menorrhagia vs catamenia

menorrhagia and catamenia both are nouns.

Word	Noun	Adjective	Verb	Adverb
menorrhagia	Yes	No	No	No
catamenia	Yes	No	No	No

As nouns, catamenia is a hypernym of menorrhagia; that is, catamenia is a word with a broader meaning than menorrhagia:

menorrhagia: abnormally heavy or prolonged menstruation; can be a symptom of uterine tumors and can lead to anemia if prolonged
catamenia: the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause

Other hypernyms of menorrhagia include flow, menses, menstruation, menstruum, period, symptom.

menorrhagia (noun)	catamenia (noun)
abnormally heavy or prolonged menstruation; can be a symptom of uterine tumors and can lead to anemia if prolonged	the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause