sewerage vs drain

sewerage and drain both are nouns.

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

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

Other hypernyms of sewerage include drainpipe, waste pipe.

sewerage (noun)	drain (noun)
a waste pipe that carries away sewage or surface water	emptying something accomplished by allowing liquid to run out of it
waste matter carried away in sewers or drains	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

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