rhinoceros beetle vs scarabaeid

rhinoceros beetle and scarabaeid both are nouns.

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

As nouns, scarabaeid is a hypernym of rhinoceros beetle; that is, scarabaeid 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
scarabaeid: any of numerous species of stout-bodied beetles having heads with horny spikes

Other hypernyms of rhinoceros beetle include scarabaean, scarabaeid beetle.

rhinoceros beetle (noun)	scarabaeid (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