suborder Heterostraci vs Heterostraci

suborder Heterostraci and Heterostraci both are nouns.

Word	Noun	Adjective	Verb	Adverb
suborder Heterostraci	Yes	No	No	No
Heterostraci	Yes	No	No	No

As nouns, suborder Heterostraci and Heterostraci are synonyms defined as:

suborder Heterostraci and Heterostraci: extinct group of armored jawless fishes or fish-like vertebrate; taxonomy is not clear

suborder Heterostraci (noun)	Heterostraci (noun)
extinct group of armored jawless fishes or fish-like vertebrate; taxonomy is not clear	extinct group of armored jawless fishes or fish-like vertebrate; taxonomy is not clear