impala vs Aepyceros melampus

impala and Aepyceros melampus both are nouns.

Word	Noun	Adjective	Verb	Adverb
impala	Yes	No	No	No
Aepyceros melampus	Yes	No	No	No

As nouns, impala and Aepyceros melampus are synonyms defined as:

impala and Aepyceros melampus: African antelope with ridged curved horns; moves with enormous leaps

impala (noun)	Aepyceros melampus (noun)
African antelope with ridged curved horns; moves with enormous leaps	African antelope with ridged curved horns; moves with enormous leaps