Homo erectus vs human being

Homo erectus and human being both are nouns.

Word	Noun	Adjective	Verb	Adverb
Homo erectus	Yes	No	No	No
human being	Yes	No	No	No

As nouns, human being is a hypernym of Homo erectus; that is, human being is a word with a broader meaning than Homo erectus:

Homo erectus: extinct species of primitive hominid with upright stature but small brain
human being: any living or extinct member of the family Hominidae characterized by superior intelligence, articulate speech, and erect carriage

Other hypernyms of Homo erectus include homo, human, man.

Homo erectus (noun)	human being (noun)
extinct species of primitive hominid with upright stature but small brain	any living or extinct member of the family Hominidae characterized by superior intelligence, articulate speech, and erect carriage