rhinoceros beetle vs scarabaean

rhinoceros beetle and scarabaean both are nouns.

Word	Noun	Adjective	Verb	Adverb
rhinoceros beetle	Yes	No	No	No
scarabaean	Yes	No	No	No

As nouns, scarabaean is a hypernym of rhinoceros beetle; that is, scarabaean is a word with a broader meaning than rhinoceros beetle:

rhinoceros beetle: any of various large chiefly tropical beetles having horns on the head; pest on coconuts
scarabaean: any of numerous species of stout-bodied beetles having heads with horny spikes

Other hypernyms of rhinoceros beetle include scarabaeid, scarabaeid beetle.

rhinoceros beetle (noun)	scarabaean (noun)
any of various large chiefly tropical beetles having horns on the head; pest on coconuts	any of numerous species of stout-bodied beetles having heads with horny spikes