family Echeneididae vs Echeneididae

family Echeneididae and Echeneididae both are nouns.

Word	Noun	Adjective	Verb	Adverb
family Echeneididae	Yes	No	No	No
Echeneididae	Yes	No	No	No

As nouns, family Echeneididae and Echeneididae are synonyms defined as:

family Echeneididae and Echeneididae: fishes having a sucking disk on the head for clinging to other fishes and to ships

Other synonyms of family Echeneididae include family Echeneidae.

family Echeneididae (noun)	Echeneididae (noun)
fishes having a sucking disk on the head for clinging to other fishes and to ships	fishes having a sucking disk on the head for clinging to other fishes and to ships