Kwanzaa vs festival

Kwanzaa and festival both are nouns.

Word	Noun	Adjective	Verb	Adverb
Kwanzaa	Yes	No	No	No
festival	Yes	No	No	No

As nouns, festival is a hypernym of Kwanzaa; that is, festival is a word with a broader meaning than Kwanzaa:

Kwanzaa: a festival featuring African-American culture; celebrated between Christmas and New Year
festival: an organized series of acts and performances (usually in one place)

Other hypernyms of Kwanzaa include fete.

Kwanzaa (noun)	festival (noun)
a festival featuring African-American culture; celebrated between Christmas and New Year	an organized series of acts and performances (usually in one place)
	a day or period of time set aside for feasting and celebration