Aepyceros melampus vs impala

Aepyceros melampus and impala both are nouns.

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

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

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

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