suborder Cephalaspida vs Osteostraci

suborder Cephalaspida and Osteostraci both are nouns.

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

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

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

Other synonyms of suborder Cephalaspida include Cephalaspida, suborder Osteostraci.

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