waste pipe vs scupper

waste pipe and scupper both are nouns.

Word	Noun	Adjective	Verb	Adverb
waste pipe	Yes	No	No	No
scupper	Yes	No	Yes	No

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

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

waste pipe (noun)	scupper (noun)
a pipe through which liquid is carried away	drain that allows water on the deck of a vessel to flow overboard

waste pipe (verb)	scupper (verb)
	put in a dangerous, disadvantageous, or difficult position
	wait in hiding to attack