feria vs festivity

feria and festivity both are nouns.

Word	Noun	Adjective	Verb	Adverb
feria	Yes	No	No	No
festivity	Yes	No	No	No

As nouns, festivity is a hypernym of feria; that is, festivity is a word with a broader meaning than feria:

feria: (in Spanish speaking regions) a local festival or fair, usually in honor of some patron saint
festivity: any joyous diversion

Other hypernyms of feria include celebration.

feria (noun)	festivity (noun)
(in Spanish speaking regions) a local festival or fair, usually in honor of some patron saint	any joyous diversion
a weekday on which no festival or holiday is celebrated