course vs flow

course and flow both are nouns.

Word	Noun	Adjective	Verb	Adverb
course	Yes	No	Yes	Yes
flow	Yes	No	Yes	No

As nouns, flow is a hyponym of course; that is, flow is a word with a more specific, narrower meaning than course:

course: a connected series of events or actions or developments
flow: dominant course (suggestive of running water) of successive events or ideas

Other hyponyms of course include current, stream.

As verbs, course and flow are synonyms defined as:

Other synonyms of course include feed, run.

course (noun)	flow (noun)
a mode of action	the act of flowing or streaming; continuous progression
education imparted in a series of lessons or meetings	the motion characteristic of fluids (liquids or gases)
facility consisting of a circumscribed area of land or water laid out for a sport	dominant course (suggestive of running water) of successive events or ideas
(construction) a layer of masonry	any uninterrupted stream or discharge
part of a meal served at one time	the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause
a connected series of events or actions or developments	something that resembles a flowing stream in moving continuously
a body of students who are taught together	the amount of fluid that flows in a given time
general line of orientation
a line or route along which something travels or moves

course (verb)	flow (verb)
hunt with hounds	undergo menstruation
move along, of liquids	cover or swamp with water
move swiftly through or over	fall or flow in a certain way
	move along, of liquids
	move or progress freely as if in a stream
	cause to flow
	be abundantly present

course (adverb)	flow (adverb)
as might be expected