WordNet sense 1 (the amount of fluid that flows in a given time):

flow rate, rate of flow

WordNet sense 2 (something that resembles a flowing stream in moving continuously):

stream

WordNet sense 3 (the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause):

menses, menstruation, period, catamenia, menstruum

WordNet sense 4 (dominant course (suggestive of running water) of successive events or ideas):

current

WordNet sense 5 (the motion characteristic of fluids (liquids or gases)):

flowing

WordNet sense 6 (move along, of liquids):

course, feed, run

WordNet sense 7 (move or progress freely as if in a stream):

flux

WordNet sense 8 (fall or flow in a certain way):

fall, hang

WordNet sense 9 (undergo menstruation):

menstruate