drain vs voidance

drain and voidance both are nouns.

Word	Noun	Adjective	Verb	Adverb
drain	Yes	No	Yes	No
voidance	Yes	No	No	No

As nouns, voidance is a hypernym of drain; that is, voidance is a word with a broader meaning than drain:

Other hypernyms of drain include emptying, evacuation.

drain (noun)	voidance (noun)
emptying something accomplished by allowing liquid to run out of it	the act of removing the contents of something
a gradual depletion of energy or resources
a pipe through which liquid is carried away
tube inserted into a body cavity (as during surgery) to remove unwanted material

drain (verb)	voidance (verb)
empty of liquid; drain the liquid from
make weak
deplete of resources
flow off gradually