dung beetle vs scarab

dung beetle and scarab both are nouns.

Word	Noun	Adjective	Verb	Adverb
dung beetle	Yes	No	No	No
scarab	Yes	No	No	No

As nouns, scarab is a hyponym of dung beetle; that is, scarab is a word with a more specific, narrower meaning than dung beetle:

dung beetle: any of numerous beetles that roll balls of dung on which they feed and in which they lay eggs
scarab: scarabaeid beetle considered divine by ancient Egyptians

Other hyponyms of dung beetle include scarabaeus, Scarabaeus sacer, tumblebug, dorbeetle.

dung beetle (noun)	scarab (noun)
any of numerous beetles that roll balls of dung on which they feed and in which they lay eggs	scarabaeid beetle considered divine by ancient Egyptians