pipe vs shout out

pipe is a noun but shout out is not a noun.

Word	Noun	Adjective	Verb	Adverb
pipe	Yes	No	Yes	No
shout out	No	No	Yes	No

As verbs, shout out is a hypernym of pipe; that is, shout out is a word with a broader meaning than pipe:

Other hypernyms of pipe include call, cry, holler, hollo, scream, shout, squall, yell.

pipe (noun)	shout out (noun)
a long tube made of metal or plastic that is used to carry water or oil or gas etc.
a tube with a small bowl at one end; used for smoking tobacco
the flues and stops on a pipe organ
a tubular wind instrument
a hollow cylindrical shape