storm sewer vs drainage well

storm sewer and drainage well both are nouns.

Word	Noun	Adjective	Verb	Adverb
storm sewer	Yes	No	No	No
drainage well	Yes	No	No	No

As nouns, storm sewer and drainage well are synonyms defined as:

storm sewer and drainage well: a system of watercourses or drains for carrying off excess water

Other synonyms of storm sewer include drain system, storm drain, stormwater drain.

storm sewer (noun)	drainage well (noun)
a system of watercourses or drains for carrying off excess water	a system of watercourses or drains for carrying off excess water