pibroch vs military march

pibroch and military march both are nouns.

Word	Noun	Adjective	Verb	Adverb
pibroch	Yes	No	No	No
military march	Yes	No	No	No

As nouns, military march is a hypernym of pibroch; that is, military march is a word with a broader meaning than pibroch:

pibroch: martial music with variations; to be played by bagpipes
military march: brisk marching music suitable for troops marching in a military parade

Other hypernyms of pibroch include martial music, military music.

pibroch (noun)	military march (noun)
martial music with variations; to be played by bagpipes	brisk marching music suitable for troops marching in a military parade