menorrhea vs menstrual flow

menorrhea and menstrual flow both are nouns.

Word	Noun	Adjective	Verb	Adverb
menorrhea	Yes	No	No	No
menstrual flow	Yes	No	No	No

As nouns, menorrhea and menstrual flow are synonyms defined as:

menorrhea and menstrual flow: flow of blood from the uterus; occurs at roughly monthly intervals during a woman's reproductive years

Other synonyms of menorrhea include menstrual blood.

menorrhea (noun)	menstrual flow (noun)
flow of blood from the uterus; occurs at roughly monthly intervals during a woman's reproductive years	flow of blood from the uterus; occurs at roughly monthly intervals during a woman's reproductive years