eisteddfod vs festival

eisteddfod and festival both are nouns.

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

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

eisteddfod: any of several annual Welsh festivals involving artistic competitions (especially in singing)
festival: an organized series of acts and performances (usually in one place)

Other hypernyms of eisteddfod include fete.

eisteddfod (noun)	festival (noun)
any of several annual Welsh festivals involving artistic competitions (especially in singing)	an organized series of acts and performances (usually in one place)
	a day or period of time set aside for feasting and celebration