Chalcidae vs Chalcididae

Chalcidae and Chalcididae both are nouns.

Word	Noun	Adjective	Verb	Adverb
Chalcidae	Yes	No	No	No
Chalcididae	Yes	No	No	No

As nouns, Chalcidae and Chalcididae are synonyms defined as:

Other synonyms of Chalcidae include family Chalcidae, family Chalcididae.

Chalcidae (noun)	Chalcididae (noun)
an arthropod family including: chalcidflies	an arthropod family including: chalcidflies