Heterostraci vs suborder Heterostraci

Heterostraci and suborder Heterostraci both are nouns.

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

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

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

Heterostraci (noun)	suborder 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