plectognath fish vs plectognath

plectognath fish and plectognath both are nouns.

Word	Noun	Adjective	Verb	Adverb
plectognath fish	Yes	No	No	No
plectognath	Yes	No	No	No

As nouns, plectognath fish and plectognath are synonyms defined as:

plectognath fish and plectognath: tropical marine fishes having the teeth fused into a beak and thick skin covered with bony plates or spines

plectognath fish (noun)	plectognath (noun)
tropical marine fishes having the teeth fused into a beak and thick skin covered with bony plates or spines	tropical marine fishes having the teeth fused into a beak and thick skin covered with bony plates or spines