overflow vs flowing

overflow and flowing both are nouns.

Word	Noun	Adjective	Verb	Adverb
overflow	Yes	No	Yes	No
flowing	Yes	Yes	No	No

As nouns, flowing is a hypernym of overflow; that is, flowing is a word with a broader meaning than overflow:

overflow: the occurrence of surplus liquid (as water) exceeding the limit or capacity
flowing: the motion characteristic of fluids (liquids or gases)

Other hypernyms of overflow include flow.

overflow (noun)	flowing (noun)
a large flow	the motion characteristic of fluids (liquids or gases)
the occurrence of surplus liquid (as water) exceeding the limit or capacity

overflow (adjective)	flowing (adjective)
	designed or arranged to offer the least resistance to fluid flow

overflow (verb)	flowing (verb)
overflow with a certain feeling
flow or run over (a limit or brim)