suborder Osteostraci vs Cephalaspida

suborder Osteostraci and Cephalaspida both are nouns.

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

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

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

Other synonyms of suborder Osteostraci include Osteostraci, suborder Cephalaspida.

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