drain vs scupper

drain and scupper both are nouns.

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

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

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

drain (noun)	scupper (noun)
emptying something accomplished by allowing liquid to run out of it	drain that allows water on the deck of a vessel to flow overboard
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)	scupper (verb)
empty of liquid; drain the liquid from	put in a dangerous, disadvantageous, or difficult position
make weak	wait in hiding to attack
deplete of resources
flow off gradually