June beetle vs figeater

June beetle and figeater both are nouns.

Word	Noun	Adjective	Verb	Adverb
June beetle	Yes	No	No	No
figeater	Yes	No	No	No

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

June beetle: any of various large usually brown North American leaf-eating beetles common in late spring; the larvae feed on roots of grasses etc.
figeater: large greenish June beetle of southern United States

Other hyponyms of June beetle include green June beetle.

June beetle (noun)	figeater (noun)
any of various large usually brown North American leaf-eating beetles common in late spring; the larvae feed on roots of grasses etc.	large greenish June beetle of southern United States