cockchafer vs Melolontha melolontha

cockchafer and Melolontha melolontha both are nouns.

Word	Noun	Adjective	Verb	Adverb
cockchafer	Yes	No	No	No
Melolontha melolontha	Yes	No	No	No

As nouns, cockchafer and Melolontha melolontha are synonyms defined as:

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

Other synonyms of cockchafer include May beetle, May bug.

cockchafer (noun)	Melolontha melolontha (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