storm drain vs drainage well

storm drain and drainage well both are nouns.

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

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

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

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

storm drain (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