Java man vs Homo erectus

Java man and Homo erectus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Java man	Yes	No	No	No
Homo erectus	Yes	No	No	No

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

Java man: fossil remains found in Java; formerly called Pithecanthropus erectus
Homo erectus: extinct species of primitive hominid with upright stature but small brain

Java man (noun)	Homo erectus (noun)
fossil remains found in Java; formerly called Pithecanthropus erectus	extinct species of primitive hominid with upright stature but small brain