flag waving vs demagogy

flag waving and demagogy both are nouns.

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

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

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

Other hypernyms of flag waving include demagoguery.

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