Melolontha melolontha vs May beetle

Melolontha melolontha and May beetle both are nouns.

Word	Noun	Adjective	Verb	Adverb
Melolontha melolontha	Yes	No	No	No
May beetle	Yes	No	No	No

As nouns, Melolontha melolontha and May beetle are synonyms defined as:

Melolontha melolontha and May beetle: any of various large European beetles destructive to vegetation as both larvae and adult

Other synonyms of Melolontha melolontha include cockchafer, May bug.

Melolontha melolontha (noun)	May beetle (noun)
any of various large European beetles destructive to vegetation as both larvae and adult	any of various large European beetles destructive to vegetation as both larvae and adult
	any of various large usually brown North American leaf-eating beetles common in late spring; the larvae feed on roots of grasses etc.