drain vs sewerage

drain and sewerage both are nouns.

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

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

Other hyponyms of drain include culvert, scupper, cloaca, sewer, soil pipe, trap.

drain (noun)	sewerage (noun)
emptying something accomplished by allowing liquid to run out of it	a waste pipe that carries away sewage or surface water
a gradual depletion of energy or resources	waste matter carried away in sewers or drains
a pipe through which liquid is carried away
tube inserted into a body cavity (as during surgery) to remove unwanted material

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