Cephalaspida vs suborder Osteostraci

Cephalaspida and suborder Osteostraci both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cephalaspida	Yes	No	No	No
suborder Osteostraci	Yes	No	No	No

As nouns, Cephalaspida and suborder Osteostraci are synonyms defined as:

Cephalaspida and suborder Osteostraci: extinct group of armored fish-like vertebrates; taxonomy is not clear

Other synonyms of Cephalaspida include Osteostraci, suborder Cephalaspida.

Cephalaspida (noun)	suborder Osteostraci (noun)
extinct group of armored fish-like vertebrates; taxonomy is not clear	extinct group of armored fish-like vertebrates; taxonomy is not clear