country music vs zydeco

country music and zydeco both are nouns.

Word	Noun	Adjective	Verb	Adverb
country music	Yes	No	No	No
zydeco	Yes	No	No	No

As nouns, zydeco is a hyponym of country music; that is, zydeco is a word with a more specific, narrower meaning than country music:

country music: a simple style of folk music heard mostly in the southern United States; usually played on stringed instruments
zydeco: music of southern Louisiana that combines French dance melodies with Caribbean music and blues

Other hyponyms of country music include bluegrass, hillbilly music.

country music (noun)	zydeco (noun)
a simple style of folk music heard mostly in the southern United States; usually played on stringed instruments	music of southern Louisiana that combines French dance melodies with Caribbean music and blues