flag waving vs demagoguery

flag waving and demagoguery both are nouns.

Word	Noun	Adjective	Verb	Adverb
flag waving	Yes	No	No	No
demagoguery	Yes	No	No	No

As nouns, demagoguery is a hypernym of flag waving; that is, demagoguery is a word with a broader meaning than flag waving:

flag waving: an appeal intended to arouse patriotic emotions
demagoguery: impassioned appeals to the prejudices and emotions of the populace

Other hypernyms of flag waving include demagogy.

flag waving (noun)	demagoguery (noun)
an appeal intended to arouse patriotic emotions	impassioned appeals to the prejudices and emotions of the populace