A vertical pipe into which water is pumped so that a desired pressure is available at the bottom. The water supply of a building for the use of firefighters.

What part of speech is the word standpipe?

STANDPIPE (noun) definition and synonyms | Macmillan Dictionary.

Is pipe a verb or noun?

verb (used with object), piped, pip·ing. to convey by or as by pipes: to pipe water from the lake. to supply with pipes. to play (music) on a pipe or pipes.