suborder Osteostraci vs suborder Cephalaspida

suborder Osteostraci and suborder Cephalaspida both are nouns.

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

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

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

Other synonyms of suborder Osteostraci include Cephalaspida, Osteostraci.

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