anoa vs Old World buffalo

anoa and Old World buffalo both are nouns.

Word	Noun	Adjective	Verb	Adverb
anoa	Yes	No	No	No
Old World buffalo	Yes	No	No	No

As nouns, Old World buffalo is a hypernym of anoa; that is, Old World buffalo is a word with a broader meaning than anoa:

anoa: small buffalo of the Celebes having small straight horns
Old World buffalo: any of several Old World animals resembling oxen including, e.g., water buffalo, Cape buffalo

Other hypernyms of anoa include buffalo.

anoa (noun)	Old World buffalo (noun)
small buffalo of the Celebes having small straight horns	any of several Old World animals resembling oxen including, e.g., water buffalo, Cape buffalo